| Invermere (AA8) | Invermere | BC | Walter A Duncan Field Illinois Valley Regional to Invermere |
| Apalachicola Regional (AAF) | Apalachicola | FL | Walter A Duncan Field Illinois Valley Regional to Apalachicola Regional |
| Lehigh Valley International (ABE) | Allentown | PA | Walter A Duncan Field Illinois Valley Regional to Lehigh Valley International |
| Abilene Regional (ABI) | Abilene | TX | Walter A Duncan Field Illinois Valley Regional to Abilene Regional |
| Albuquerque/Sunport International (ABQ) | Albuquerque | NM | Walter A Duncan Field Illinois Valley Regional to Albuquerque/Sunport International |
| Aberdeen Regional (ABR) | Aberdeen | SD | Walter A Duncan Field Illinois Valley Regional to Aberdeen Regional |
| Southwest Georgia Regional (ABY) | Albany | GA | Walter A Duncan Field Illinois Valley Regional to Southwest Georgia Regional |
| Gen Juan Alvarez International (ACA) | Acapulco | Gue | Walter A Duncan Field Illinois Valley Regional to Gen Juan Alvarez International |
| Antrim County (ACB) | Bellaire | MI | Walter A Duncan Field Illinois Valley Regional to Antrim County |
| Nantucket Memorial (ACK) | Nantucket | MA | Walter A Duncan Field Illinois Valley Regional to Nantucket Memorial |
| Ciudad Acuna International (ACN) | Ciudad Acuna | Coa | Walter A Duncan Field Illinois Valley Regional to Ciudad Acuna International |
| Waco Regional (ACT) | Waco | TX | Walter A Duncan Field Illinois Valley Regional to Waco Regional |
| California Redwood Coast-Humboldt County (ACV) | Arcata | CA | Walter A Duncan Field Illinois Valley Regional to California Redwood Coast-Humboldt County |
| Atlantic City International (ACY) | Atlantic City | NJ | Walter A Duncan Field Illinois Valley Regional to Atlantic City International |
| Lenawee County (ADG) | Adrian | MI | Walter A Duncan Field Illinois Valley Regional to Lenawee County |
| Ardmore Municipal (ADM) | Ardmore | OK | Walter A Duncan Field Illinois Valley Regional to Ardmore Municipal |
| Kodiak (ADQ) | Kodiak | AK | Walter A Duncan Field Illinois Valley Regional to Kodiak |
| Robert F Swinnie (ADR) | Andrews | SC | Walter A Duncan Field Illinois Valley Regional to Robert F Swinnie |
| Addison/Dallas (ADS) | Dallas | TX | Walter A Duncan Field Illinois Valley Regional to Addison/Dallas |
| Ada Municipal (ADT) | Ada | OK | Walter A Duncan Field Illinois Valley Regional to Ada Municipal |
| Albert Lea Municipal (AEL) | Albert Lea | MN | Walter A Duncan Field Illinois Valley Regional to Albert Lea Municipal |
| Alexandria International (AEX) | Alexandria | LA | Walter A Duncan Field Illinois Valley Regional to Alexandria International |
| Jaffrey Silver Ranch (AFN) | Jaffrey | NH | Walter A Duncan Field Illinois Valley Regional to Jaffrey Silver Ranch |
| Afton Municipal (AFO) | Afton | WY | Walter A Duncan Field Illinois Valley Regional to Afton Municipal |
| Fort Worth Alliance (AFW) | Fort Worth | TX | Walter A Duncan Field Illinois Valley Regional to Fort Worth Alliance |
| Allegheny County (AGC) | Pittsburgh | PA | Walter A Duncan Field Illinois Valley Regional to Allegheny County |
| Magnolia Municipal (AGO) | Magnolia | AR | Walter A Duncan Field Illinois Valley Regional to Magnolia Municipal |
| Augusta Regional/Bush Field (AGS) | Augusta | GA | Walter A Duncan Field Illinois Valley Regional to Augusta Regional/Bush Field |
| Aguascalientes/Jesus Teran Intl (AGU) | Aguascalientes | Agu | Walter A Duncan Field Illinois Valley Regional to Aguascalientes/Jesus Teran Intl |
| Valemount (AH4) | Valemount | BC | Walter A Duncan Field Illinois Valley Regional to Valemount |
| Ardmore Downtown Executive (AHD) | Ardmore | OK | Walter A Duncan Field Illinois Valley Regional to Ardmore Downtown Executive |
| Arapahoe Municipal (AHF) | Arapahoe | NE | Walter A Duncan Field Illinois Valley Regional to Arapahoe Municipal |
| Amery Municipal (AHH) | Amery | WI | Walter A Duncan Field Illinois Valley Regional to Amery Municipal |
| Ashland Municipal-Sumner Parker Field (AHM) | Ashland | OR | Walter A Duncan Field Illinois Valley Regional to Ashland Municipal-Sumner Parker Field |
| Athens/Ben Epps (AHN) | Athens | GA | Walter A Duncan Field Illinois Valley Regional to Athens/Ben Epps |
| Alliance Municipal (AIA) | Alliance | NE | Walter A Duncan Field Illinois Valley Regional to Alliance Municipal |
| Anderson Municipal-Darlington Field (AID) | Anderson | IN | Walter A Duncan Field Illinois Valley Regional to Anderson Municipal-Darlington Field |
| Aiken Regional (AIK) | Aiken | SC | Walter A Duncan Field Illinois Valley Regional to Aiken Regional |
| Atlantic Municipal (AIO) | Atlantic | IA | Walter A Duncan Field Illinois Valley Regional to Atlantic Municipal |
| George Downer (AIV) | Aliceville | AL | Walter A Duncan Field Illinois Valley Regional to George Downer |
| Lee C Fine Memorial (AIZ) | KAISER/LAKE OZARK | MO | Walter A Duncan Field Illinois Valley Regional to Lee C Fine Memorial |
| Cayley/A J Flying Ranch (AJ7) | Cayley | AB | Walter A Duncan Field Illinois Valley Regional to Cayley/A J Flying Ranch |
| Akron Fulton International (AKC) | Akron | OH | Walter A Duncan Field Illinois Valley Regional to Akron Fulton International |
| King Salmon (AKN) | King Salmon | AK | Walter A Duncan Field Illinois Valley Regional to King Salmon |
| Colorado Plains Regional (AKO) | Akron | CO | Walter A Duncan Field Illinois Valley Regional to Colorado Plains Regional |
| Fort Mackay (AL4) | Albian | AB | Walter A Duncan Field Illinois Valley Regional to Fort Mackay |
| Albany International (ALB) | Albany | NY | Walter A Duncan Field Illinois Valley Regional to Albany International |
| Alpine-Casparis Municipal (ALE) | Alpine | TX | Walter A Duncan Field Illinois Valley Regional to Alpine-Casparis Municipal |
| Alice International (ALI) | Alice | TX | Walter A Duncan Field Illinois Valley Regional to Alice International |
| Alamogordo White Sands Regional (ALM) | Alamogordo | NM | Walter A Duncan Field Illinois Valley Regional to Alamogordo White Sands Regional |
| St Louis Regional (ALN) | Alton | IL | Walter A Duncan Field Illinois Valley Regional to St Louis Regional |
| Waterloo Regional (ALO) | Waterloo | IA | Walter A Duncan Field Illinois Valley Regional to Waterloo Regional |
| San Luis Valley Regional/Bergman Field (ALS) | Alamosa | CO | Walter A Duncan Field Illinois Valley Regional to San Luis Valley Regional/Bergman Field |
| Walla Walla Regional (ALW) | Walla Walla | WA | Walter A Duncan Field Illinois Valley Regional to Walla Walla Regional |
| Thomas C Russell Field (ALX) | Alexander City | AL | Walter A Duncan Field Illinois Valley Regional to Thomas C Russell Field |
| Rick Husband Amarillo International (AMA) | Amarillo | TX | Walter A Duncan Field Illinois Valley Regional to Rick Husband Amarillo International |
| Animas Air Park (AMK) | Durango | CO | Walter A Duncan Field Illinois Valley Regional to Animas Air Park |
| Gratiot Community (AMN) | Alma | MI | Walter A Duncan Field Illinois Valley Regional to Gratiot Community |
| Ames Municipal (AMW) | Ames | IA | Walter A Duncan Field Illinois Valley Regional to Ames Municipal |
| Anniston Regional (ANB) | Anniston | AL | Walter A Duncan Field Illinois Valley Regional to Anniston Regional |
| Ted Stevens Anchorage International (ANC) | Anchorage | AK | Walter A Duncan Field Illinois Valley Regional to Ted Stevens Anchorage International |
| Anderson Regional (AND) | Anderson | SC | Walter A Duncan Field Illinois Valley Regional to Anderson Regional |
| Aniak (ANI) | Aniak | AK | Walter A Duncan Field Illinois Valley Regional to Aniak |
| Lee (ANP) | Annapolis | MD | Walter A Duncan Field Illinois Valley Regional to Lee |
| Tri-State Steuben County (ANQ) | Angola | IN | Walter A Duncan Field Illinois Valley Regional to Tri-State Steuben County |
| V C Bird International/St. John's (ANU) | St John's | Lim | Walter A Duncan Field Illinois Valley Regional to V C Bird International/St. John's |
| Ainsworth Regional (ANW) | Ainsworth | NE | Walter A Duncan Field Illinois Valley Regional to Ainsworth Regional |
| Anthony Municipal (ANY) | Anthony | KS | Walter A Duncan Field Illinois Valley Regional to Anthony Municipal |
| Lima Allen County (AOH) | Lima | OH | Walter A Duncan Field Illinois Valley Regional to Lima Allen County |
| Altoona/Blair County (AOO) | Altoona | PA | Walter A Duncan Field Illinois Valley Regional to Altoona/Blair County |
| Centennial (APA) | Denver | CO | Walter A Duncan Field Illinois Valley Regional to Centennial |
| Napa County (APC) | Napa | CA | Walter A Duncan Field Illinois Valley Regional to Napa County |
| Naples Municipal (APF) | Naples | FL | Walter A Duncan Field Illinois Valley Regional to Naples Municipal |
| Alpena County Regional (APN) | Alpena | MI | Walter A Duncan Field Illinois Valley Regional to Alpena County Regional |
| Marion County-Brown Field (APT) | Jasper | TN | Walter A Duncan Field Illinois Valley Regional to Marion County-Brown Field |
| Apple Valley (APV) | Apple Valley | CA | Walter A Duncan Field Illinois Valley Regional to Apple Valley |
| Nakusp (AQ5) | Nakusp | BC | Walter A Duncan Field Illinois Valley Regional to Nakusp |
| New Iberia/Acadiana Regional (ARA) | New Iberia | LA | Walter A Duncan Field Illinois Valley Regional to New Iberia/Acadiana Regional |
| Ann Arbor Municipal (ARB) | Ann Arbor | MI | Walter A Duncan Field Illinois Valley Regional to Ann Arbor Municipal |
| Walnut Ridge Regional (ARG) | Walnut Ridge | AR | Walter A Duncan Field Illinois Valley Regional to Walnut Ridge Regional |
| Watertown International (ART) | Watertown | NY | Walter A Duncan Field Illinois Valley Regional to Watertown International |
| Lakeland/Noble F. Lee Memorial Field (ARV) | Minocqua | WI | Walter A Duncan Field Illinois Valley Regional to Lakeland/Noble F. Lee Memorial Field |
| Andros Town/Fresh Creek (ASD) | Andros Island | | Walter A Duncan Field Illinois Valley Regional to Andros Town/Fresh Creek |
| Aspen-Pitkin County/Sardy Field (ASE) | Aspen | CO | Walter A Duncan Field Illinois Valley Regional to Aspen-Pitkin County/Sardy Field |
| Nashua-Boire Field (ASH) | Nashua | NH | Walter A Duncan Field Illinois Valley Regional to Nashua-Boire Field |
| Harrison County (ASL) | Marshall | TX | Walter A Duncan Field Illinois Valley Regional to Harrison County |
| Talladega Municipal (ASN) | Talladega | AL | Walter A Duncan Field Illinois Valley Regional to Talladega Municipal |
| Austin (ASQ) | Austin | NV | Walter A Duncan Field Illinois Valley Regional to Austin |
| Astoria Regional (AST) | Astoria | OR | Walter A Duncan Field Illinois Valley Regional to Astoria Regional |
| John F Kennedy Memorial (ASX) | Ashland | WI | Walter A Duncan Field Illinois Valley Regional to John F Kennedy Memorial |
| Ashley Municipal (ASY) | Ashley | ND | Walter A Duncan Field Illinois Valley Regional to Ashley Municipal |
| Arthur's Town (ATC) | Cat Island | | Walter A Duncan Field Illinois Valley Regional to Arthur's Town |
| Antlers Municipal (ATE) | Antlers | OK | Walter A Duncan Field Illinois Valley Regional to Antlers Municipal |
| Hartsfield Jackson Atlanta International (ATL) | Atlanta | GA | Walter A Duncan Field Illinois Valley Regional to Hartsfield Jackson Atlanta International |
| Gordon K Bush Ohio University (ATO) | Athens/Albany | OH | Walter A Duncan Field Illinois Valley Regional to Gordon K Bush Ohio University |
| Artesia Municipal (ATS) | Artesia | NM | Walter A Duncan Field Illinois Valley Regional to Artesia Municipal |
| Appleton International (ATW) | Appleton | WI | Walter A Duncan Field Illinois Valley Regional to Appleton International |
| Watertown Regional (ATY) | Watertown | SD | Walter A Duncan Field Illinois Valley Regional to Watertown Regional |
| Oliver (AU3) | Oliver | BC | Walter A Duncan Field Illinois Valley Regional to Oliver |
| Vanderhoof (AU4) | Vanderhoof | BC | Walter A Duncan Field Illinois Valley Regional to Vanderhoof |
| Reina Beatrix International (AUA) | Oranjestad | | Walter A Duncan Field Illinois Valley Regional to Reina Beatrix International |
| Augusta State (AUG) | Augusta | ME | Walter A Duncan Field Illinois Valley Regional to Augusta State |
| Austin Municipal (AUM) | Austin | MN | Walter A Duncan Field Illinois Valley Regional to Austin Municipal |
| Auburn Municipal (AUN) | Auburn | CA | Walter A Duncan Field Illinois Valley Regional to Auburn Municipal |
| Auburn University Regional (AUO) | Auburn | AL | Walter A Duncan Field Illinois Valley Regional to Auburn University Regional |
| Austin Bergstrom International (AUS) | Austin | TX | Walter A Duncan Field Illinois Valley Regional to Austin Bergstrom International |
| Wausau Downtown (AUW) | Wausau | WI | Walter A Duncan Field Illinois Valley Regional to Wausau Downtown |
| Chicago/Aurora Municipal (AUZ) | Chicago | IL | Walter A Duncan Field Illinois Valley Regional to Chicago/Aurora Municipal |
| Asheville Regional (AVL) | Asheville | NC | Walter A Duncan Field Illinois Valley Regional to Asheville Regional |
| Avon Park Executive (AVO) | Avon Park | FL | Walter A Duncan Field Illinois Valley Regional to Avon Park Executive |
| Wilkes-Barre/Scranton International (AVP) | Scranton | PA | Walter A Duncan Field Illinois Valley Regional to Wilkes-Barre/Scranton International |
| Marana Regional (AVW) | Tucson | AZ | Walter A Duncan Field Illinois Valley Regional to Marana Regional |
| Catalina (AVX) | Avalon | CA | Walter A Duncan Field Illinois Valley Regional to Catalina |
| West Memphis Municipal (AWM) | West Memphis | AR | Walter A Duncan Field Illinois Valley Regional to West Memphis Municipal |
| Wallblake/Clayton J Lloyd International (AXA) | The Valley | | Walter A Duncan Field Illinois Valley Regional to Wallblake/Clayton J Lloyd International |
| Algona Municipal (AXG) | Algona | IA | Walter A Duncan Field Illinois Valley Regional to Algona Municipal |
| Chandler Field (AXN) | Alexandria | MN | Walter A Duncan Field Illinois Valley Regional to Chandler Field |
| Spring Point (AXP) | Acklins Island | | Walter A Duncan Field Illinois Valley Regional to Spring Point |
| Altus/Quartz Mountain Regional (AXS) | Altus | OK | Walter A Duncan Field Illinois Valley Regional to Altus/Quartz Mountain Regional |
| Auglaize County Neil Armstrong (AXV) | Wapakoneta | OH | Walter A Duncan Field Illinois Valley Regional to Auglaize County Neil Armstrong |
| Angel Fire (Colfax County) (AXX) | Angel Fire | NM | Walter A Duncan Field Illinois Valley Regional to Angel Fire (Colfax County) |
| Waycross-Ware County (AYS) | Waycross | GA | Walter A Duncan Field Illinois Valley Regional to Waycross-Ware County |
| Cache Creek (AZ5) | Cache-Creek | BC | Walter A Duncan Field Illinois Valley Regional to Cache Creek |
| Phoenix-Mesa Gateway (AZA) | Phoenix | AZ | Walter A Duncan Field Illinois Valley Regional to Phoenix-Mesa Gateway |
| Kalamazoo/Battle Creek International (AZO) | Kalamazoo | MI | Walter A Duncan Field Illinois Valley Regional to Kalamazoo/Battle Creek International |
| El Catey Presidente Juan Bosch (AZS) | Samana | | Walter A Duncan Field Illinois Valley Regional to El Catey Presidente Juan Bosch |
| Barnes Municipal (BAF) | Westfield | MA | Walter A Duncan Field Illinois Valley Regional to Barnes Municipal |
| Battle Mountain (BAM) | Battle Mountain | NV | Walter A Duncan Field Illinois Valley Regional to Battle Mountain |
| Benson Municipal (BBB) | Benson | MN | Walter A Duncan Field Illinois Valley Regional to Benson Municipal |
| Bay City Regional (BBC) | Bay City | TX | Walter A Duncan Field Illinois Valley Regional to Bay City Regional |
| Curtis Field (BBD) | Brady | TX | Walter A Duncan Field Illinois Valley Regional to Curtis Field |
| Broken Bow Municipal/Keith Glaze Field (BBW) | Broken Bow | NE | Walter A Duncan Field Illinois Valley Regional to Broken Bow Municipal/Keith Glaze Field |
| Wings Field (BBX) | Philadelphia | PA | Walter A Duncan Field Illinois Valley Regional to Wings Field |
| Virginia Tech Montgomery Executive (BCB) | Blacksburg | VA | Walter A Duncan Field Illinois Valley Regional to Virginia Tech Montgomery Executive |
| Bryce Canyon (BCE) | Bryce Canyon | UT | Walter A Duncan Field Illinois Valley Regional to Bryce Canyon |
| Boca Raton (BCT) | Boca Raton | FL | Walter A Duncan Field Illinois Valley Regional to Boca Raton |
| L F Wade Bermuda International (BDA) | Hamilton | | Walter A Duncan Field Illinois Valley Regional to L F Wade Bermuda International |
| Baudette International (BDE) | Baudette | MN | Walter A Duncan Field Illinois Valley Regional to Baudette International |
| Blanding Municipal (BDG) | Blanding | UT | Walter A Duncan Field Illinois Valley Regional to Blanding Municipal |
| Bradley International (BDL) | Windsor Locks | CT | Walter A Duncan Field Illinois Valley Regional to Bradley International |
| Igor I Sikorsky Memorial (BDR) | Bridgeport | CT | Walter A Duncan Field Illinois Valley Regional to Igor I Sikorsky Memorial |
| Bandon State (BDY) | Bandon | OR | Walter A Duncan Field Illinois Valley Regional to Bandon State |
| Beech Factory (BEC) | Wichita | KS | Walter A Duncan Field Illinois Valley Regional to Beech Factory |
| Laurence G Hanscom Field (BED) | Bedford | MA | Walter A Duncan Field Illinois Valley Regional to Laurence G Hanscom Field |
| Southwest Michigan Regional (BEH) | Benton Harbor | MI | Walter A Duncan Field Illinois Valley Regional to Southwest Michigan Regional |
| Bethel (BET) | Bethel | AK | Walter A Duncan Field Illinois Valley Regional to Bethel |
| Bradford Regional (BFD) | Bradford | PA | Walter A Duncan Field Illinois Valley Regional to Bradford Regional |
| Western Nebraska Regional/William B Heilig Field (BFF) | Scottsbluff | NE | Walter A Duncan Field Illinois Valley Regional to Western Nebraska Regional/William B Heilig Field |
| Bullfrog Basin (BFG) | Glen Canyon | UT | Walter A Duncan Field Illinois Valley Regional to Bullfrog Basin |
| King County International Boeing Field (BFI) | Seattle | WA | Walter A Duncan Field Illinois Valley Regional to King County International Boeing Field |
| Meadows Field (BFL) | Bakersfield | CA | Walter A Duncan Field Illinois Valley Regional to Meadows Field |
| Mobile Downtown (BFM) | Mobile | AL | Walter A Duncan Field Illinois Valley Regional to Mobile Downtown |
| Beaver County (BFP) | Beaver Falls | PA | Walter A Duncan Field Illinois Valley Regional to Beaver County |
| Virgil I Grissom Municipal (BFR) | Bedford | IN | Walter A Duncan Field Illinois Valley Regional to Virgil I Grissom Municipal |
| Beaufort County (BFT) | Beaufort | SC | Walter A Duncan Field Illinois Valley Regional to Beaufort County |
| Hutchinson County (BGD) | Borger | TX | Walter A Duncan Field Illinois Valley Regional to Hutchinson County |
| Decatur County Industrial Air Park (BGE) | Bainbridge | GA | Walter A Duncan Field Illinois Valley Regional to Decatur County Industrial Air Park |
| Bridgetown Grantley Adams International (BGI) | Bridgetown | | Walter A Duncan Field Illinois Valley Regional to Bridgetown Grantley Adams International |
| Greater Binghamton Edwin A Link Field (BGM) | Binghamton | NY | Walter A Duncan Field Illinois Valley Regional to Greater Binghamton Edwin A Link Field |
| Bangor International (BGR) | Bangor | ME | Walter A Duncan Field Illinois Valley Regional to Bangor International |
| Bagdad (BGT) | Bagdad | AZ | Walter A Duncan Field Illinois Valley Regional to Bagdad |
| Hancock County-Bar Harbor (BHB) | Bar Harbor | ME | Walter A Duncan Field Illinois Valley Regional to Hancock County-Bar Harbor |
| Birmingham-Shuttlesworth International (BHM) | Birmingham | AL | Walter A Duncan Field Illinois Valley Regional to Birmingham-Shuttlesworth International |
| Block Island State (BID) | Block Island | RI | Walter A Duncan Field Illinois Valley Regional to Block Island State |
| Beatrice Municipal (BIE) | Beatrice | NE | Walter A Duncan Field Illinois Valley Regional to Beatrice Municipal |
| Bishop Regional (BIH) | Bishop | CA | Walter A Duncan Field Illinois Valley Regional to Bishop Regional |
| Billings Logan International (BIL) | Billings | MT | Walter A Duncan Field Illinois Valley Regional to Billings Logan International |
| South Bimini (BIM) | Bimini Islands | | Walter A Duncan Field Illinois Valley Regional to South Bimini |
| Bismarck Municipal (BIS) | Bismarck | ND | Walter A Duncan Field Illinois Valley Regional to Bismarck Municipal |
| Echo Valley (BJ4) | Echo Valley | BC | Walter A Duncan Field Illinois Valley Regional to Echo Valley |
| Rocky Mountain Metropolitan/Jeffco (BJC) | Denver | CO | Walter A Duncan Field Illinois Valley Regional to Rocky Mountain Metropolitan/Jeffco |
| Bemidji Regional (BJI) | Bemidji | MN | Walter A Duncan Field Illinois Valley Regional to Bemidji Regional |
| Wayne County (BJJ) | Wooster | OH | Walter A Duncan Field Illinois Valley Regional to Wayne County |
| Leon/Bajio/Guanajuato International (BJX) | Leon | Gua | Walter A Duncan Field Illinois Valley Regional to Leon/Bajio/Guanajuato International |
| Stephens County (BKD) | Breckenridge | TX | Walter A Duncan Field Illinois Valley Regional to Stephens County |
| Baker City Municipal (BKE) | Baker City | OR | Walter A Duncan Field Illinois Valley Regional to Baker City Municipal |
| Branson (BKG) | Branson | MO | Walter A Duncan Field Illinois Valley Regional to Branson |
| Burke Lakefront (BKL) | Cleveland | OH | Walter A Duncan Field Illinois Valley Regional to Burke Lakefront |
| Allen C Perkinson Blackstone Army Air Field (BKT) | Blackstone | VA | Walter A Duncan Field Illinois Valley Regional to Allen C Perkinson Blackstone Army Air Field |
| Raleigh County Memorial (BKW) | Beckley | WV | Walter A Duncan Field Illinois Valley Regional to Raleigh County Memorial |
| Brookings Regional (BKX) | Brookings | SD | Walter A Duncan Field Illinois Valley Regional to Brookings Regional |
| Boulder City Municipal (BLD) | Boulder City | NV | Walter A Duncan Field Illinois Valley Regional to Boulder City Municipal |
| Mercer County (BLF) | Bluefield | WV | Walter A Duncan Field Illinois Valley Regional to Mercer County |
| Blythe (BLH) | Blythe | CA | Walter A Duncan Field Illinois Valley Regional to Blythe |
| Bellingham International (BLI) | Bellingham | WA | Walter A Duncan Field Illinois Valley Regional to Bellingham International |
| Monmouth Executive (BLM) | Belmar | NJ | Walter A Duncan Field Illinois Valley Regional to Monmouth Executive |
| Blue Canyon - Nyack (BLU) | Emigrant Gap | CA | Walter A Duncan Field Illinois Valley Regional to Blue Canyon - Nyack |
| MidAmerica St Louis Scott AFB (BLV) | Belleville | IL | Walter A Duncan Field Illinois Valley Regional to MidAmerica St Louis Scott AFB |
| Brigham City Regional (BMC) | Brigham City | UT | Walter A Duncan Field Illinois Valley Regional to Brigham City Regional |
| Monroe County (BMG) | Bloomington | IN | Walter A Duncan Field Illinois Valley Regional to Monroe County |
| Central Illinois Regional at Bloomington Normal (BMI) | Bloomington | IL | Walter A Duncan Field Illinois Valley Regional to Central Illinois Regional at Bloomington Normal |
| Berlin Regional (BML) | Berlin | NH | Walter A Duncan Field Illinois Valley Regional to Berlin Regional |
| Beaumont Municipal (BMT) | Beaumont | TX | Walter A Duncan Field Illinois Valley Regional to Beaumont Municipal |
| Nashville International (BNA) | Nashville | TN | Walter A Duncan Field Illinois Valley Regional to Nashville International |
| Banning Municipal (BNG) | Banning | CA | Walter A Duncan Field Illinois Valley Regional to Banning Municipal |
| Barnwell Regional (BNL) | Barnwell | SC | Walter A Duncan Field Illinois Valley Regional to Barnwell Regional |
| Burns Municipal (BNO) | Burns | OR | Walter A Duncan Field Illinois Valley Regional to Burns Municipal |
| Boone Municipal (BNW) | Boone | IA | Walter A Duncan Field Illinois Valley Regional to Boone Municipal |
| Boise Air Terminal Gowen Field (BOI) | Boise | ID | Walter A Duncan Field Illinois Valley Regional to Boise Air Terminal Gowen Field |
| Brookings Airport (BOK) | Brookings | OR | Walter A Duncan Field Illinois Valley Regional to Brookings Airport |
| Flamingo (BON) | Bonaire Island | | Walter A Duncan Field Illinois Valley Regional to Flamingo |
| Boston Logan International (BOS) | Boston | MA | Walter A Duncan Field Illinois Valley Regional to Boston Logan International |
| Bartow Executive (BOW) | Bartow | FL | Walter A Duncan Field Illinois Valley Regional to Bartow Executive |
| Miley Memorial Field (Big Piney) (BPI) | Big Piney | WY | Walter A Duncan Field Illinois Valley Regional to Miley Memorial Field (Big Piney) |
| Jack Brooks Regional (BPT) | Beaumont/Port Arthur | TX | Walter A Duncan Field Illinois Valley Regional to Jack Brooks Regional |
| Woodcock (BQ8) | Woodcock | BC | Walter A Duncan Field Illinois Valley Regional to Woodcock |
| Brunswick Golden Isles (BQK) | Brunswick | GA | Walter A Duncan Field Illinois Valley Regional to Brunswick Golden Isles |
| Aguadilla/Rafael Hernandez (Borinquen) (BQN) | Aguadilla | | Walter A Duncan Field Illinois Valley Regional to Aguadilla/Rafael Hernandez (Borinquen) |
| Kaslo (BR2) | Kaslo | BC | Walter A Duncan Field Illinois Valley Regional to Kaslo |
| Brainerd Lakes Regional (BRD) | Brainerd | MN | Walter A Duncan Field Illinois Valley Regional to Brainerd Lakes Regional |
| Southeast Iowa Regional (BRL) | Burlington | IA | Walter A Duncan Field Illinois Valley Regional to Southeast Iowa Regional |
| Brownsville/South Padre Island International (BRO) | Brownsville | TX | Walter A Duncan Field Illinois Valley Regional to Brownsville/South Padre Island International |
| Samuels Field (BRY) | Bardstown | KY | Walter A Duncan Field Illinois Valley Regional to Samuels Field |
| Bisbee Municipal (BSQ) | Bisbee | AZ | Walter A Duncan Field Illinois Valley Regional to Bisbee Municipal |
| Skypark (BTF) | Bountiful | UT | Walter A Duncan Field Illinois Valley Regional to Skypark |
| Battle Creek Executive (BTL) | Battle Creek | MI | Walter A Duncan Field Illinois Valley Regional to Battle Creek Executive |
| Bert Mooney (BTM) | Butte | MT | Walter A Duncan Field Illinois Valley Regional to Bert Mooney |
| Marlboro County Jetport - H.E. Avent Field (BTN) | Bennettsville | SC | Walter A Duncan Field Illinois Valley Regional to Marlboro County Jetport - H.E. Avent Field |
| Pittsburgh/Butler Regional Airport (BTP) | Butler | PA | Walter A Duncan Field Illinois Valley Regional to Pittsburgh/Butler Regional Airport |
| Baton Rouge Metro Ryan Field (BTR) | Baton Rouge | LA | Walter A Duncan Field Illinois Valley Regional to Baton Rouge Metro Ryan Field |
| Bettles Airport (BTT) | Bettles | AK | Walter A Duncan Field Illinois Valley Regional to Bettles Airport |
| Burlington International (BTV) | Burlington | VT | Walter A Duncan Field Illinois Valley Regional to Burlington International |
| Beatty (BTY) | Beatty | NV | Walter A Duncan Field Illinois Valley Regional to Beatty |
| Cram Field (BUB) | Burwell | NE | Walter A Duncan Field Illinois Valley Regional to Cram Field |
| Buffalo Niagara International (BUF) | Buffalo | NY | Walter A Duncan Field Illinois Valley Regional to Buffalo Niagara International |
| Butler Memorial (BUM) | Butler | MO | Walter A Duncan Field Illinois Valley Regional to Butler Memorial |
| Hollywood Burbank (BUR) | Burbank | CA | Walter A Duncan Field Illinois Valley Regional to Hollywood Burbank |
| Bartlesville Municipal (BVO) | Bartlesville | OK | Walter A Duncan Field Illinois Valley Regional to Bartlesville Municipal |
| Batesville Regional (BVX) | Batesville | AR | Walter A Duncan Field Illinois Valley Regional to Batesville Regional |
| Beverly Regional (BVY) | Beverly | MA | Walter A Duncan Field Illinois Valley Regional to Beverly Regional |
| Brawley Municipal (BWC) | Brawley | CA | Walter A Duncan Field Illinois Valley Regional to Brawley Municipal |
| Brownwood Regional (BWD) | Brownwood | TX | Walter A Duncan Field Illinois Valley Regional to Brownwood Regional |
| Bowling Green Warren County Regional (BWG) | Bowling Green | KY | Walter A Duncan Field Illinois Valley Regional to Bowling Green Warren County Regional |
| Baltimore/Washington Intl Thurgood Marshall (BWI) | Baltimore | MD | Walter A Duncan Field Illinois Valley Regional to Baltimore/Washington Intl Thurgood Marshall |
| Bowman Municipal (BWM) | Bowman | ND | Walter A Duncan Field Illinois Valley Regional to Bowman Municipal |
| George R Carr Memorial Airfield (BXA) | Bogalusa | LA | Walter A Duncan Field Illinois Valley Regional to George R Carr Memorial Airfield |
| Buckeye Municipal (BXK) | Buckeye | AZ | Walter A Duncan Field Illinois Valley Regional to Buckeye Municipal |
| Borrego Valley (BXS) | Borrego Springs | CA | Walter A Duncan Field Illinois Valley Regional to Borrego Valley |
| Johnson County (BYG) | Buffalo | WY | Walter A Duncan Field Illinois Valley Regional to Johnson County |
| Arkansas International (BYH) | Blytheville | AR | Walter A Duncan Field Illinois Valley Regional to Arkansas International |
| Burley Municipal (BYI) | Burley | ID | Walter A Duncan Field Illinois Valley Regional to Burley Municipal |
| Fraser Lake (BZ9) | Fraser Lake | BC | Walter A Duncan Field Illinois Valley Regional to Fraser Lake |
| Bozeman Yellowstone International (BZN) | Bozeman | MT | Walter A Duncan Field Illinois Valley Regional to Bozeman Yellowstone International |
| Wexford County (CAD) | Cadillac | MI | Walter A Duncan Field Illinois Valley Regional to Wexford County |
| Columbia Metropolitan (CAE) | Columbia | SC | Walter A Duncan Field Illinois Valley Regional to Columbia Metropolitan |
| Akron/Canton Regional (CAK) | Akron | OH | Walter A Duncan Field Illinois Valley Regional to Akron/Canton Regional |
| Clayton Municipal Airpark (CAO) | Clayton | NM | Walter A Duncan Field Illinois Valley Regional to Clayton Municipal Airpark |
| Cap Haitien (CAP) | Cap Haitien | | Walter A Duncan Field Illinois Valley Regional to Cap Haitien |
| Caribou Municipal (CAR) | Caribou | ME | Walter A Duncan Field Illinois Valley Regional to Caribou Municipal |
| Greater Cumberland Regional (CBE) | Cumberland | MD | Walter A Duncan Field Illinois Valley Regional to Greater Cumberland Regional |
| Council Bluffs Municipal (CBF) | Council Bluffs | IA | Walter A Duncan Field Illinois Valley Regional to Council Bluffs Municipal |
| Shalz Field (CBK) | Colby | KS | Walter A Duncan Field Illinois Valley Regional to Shalz Field |
| Clinton Municipal (CCA) | Clinton | AR | Walter A Duncan Field Illinois Valley Regional to Clinton Municipal |
| Cable (CCB) | Upland | CA | Walter A Duncan Field Illinois Valley Regional to Cable |
| L'esperance/Grand Case (CCE) | Grand Case | | Walter A Duncan Field Illinois Valley Regional to L'esperance/Grand Case |
| Crane County (CCG) | Crane | TX | Walter A Duncan Field Illinois Valley Regional to Crane County |
| Buchanan Field (CCR) | Concord | CA | Walter A Duncan Field Illinois Valley Regional to Buchanan Field |
| Northeast Iowa Regional (CCY) | Charles City | IA | Walter A Duncan Field Illinois Valley Regional to Northeast Iowa Regional |
| Chub Cay (CCZ) | Berry Islands | | Walter A Duncan Field Illinois Valley Regional to Chub Cay |
| Cold Bay (CDB) | Cold Bay | AK | Walter A Duncan Field Illinois Valley Regional to Cold Bay |
| Cedar City Regional (CDC) | Cedar City | UT | Walter A Duncan Field Illinois Valley Regional to Cedar City Regional |
| Harrell Field (CDH) | Camden | AR | Walter A Duncan Field Illinois Valley Regional to Harrell Field |
| George T Lewis Airport (CDK) | Cedar Key | FL | Walter A Duncan Field Illinois Valley Regional to George T Lewis Airport |
| Woodward Field (CDN) | Camden | SC | Walter A Duncan Field Illinois Valley Regional to Woodward Field |
| Chadron Municipal (CDR) | Chadron | NE | Walter A Duncan Field Illinois Valley Regional to Chadron Municipal |
| Childress Municipal (CDS) | Childress | TX | Walter A Duncan Field Illinois Valley Regional to Childress Municipal |
| Essex County (CDW) | Caldwell | NJ | Walter A Duncan Field Illinois Valley Regional to Essex County |
| Juniper (CE3) | Juniper | NB | Walter A Duncan Field Illinois Valley Regional to Juniper |
| Cessna Aircraft Field (CEA) | Wichita | KS | Walter A Duncan Field Illinois Valley Regional to Cessna Aircraft Field |
| Del Norte Co Regional/Jack Mcnamara Field (CEC) | Crescent City | CA | Walter A Duncan Field Illinois Valley Regional to Del Norte Co Regional/Jack Mcnamara Field |
| Westover Arb/Westover Metropolitan (CEF) | Chicopee | MA | Walter A Duncan Field Illinois Valley Regional to Westover Arb/Westover Metropolitan |
| Ciudad Obregon International (CEN) | Ciudad Obregon | Son | Walter A Duncan Field Illinois Valley Regional to Ciudad Obregon International |
| Oconee County Regional (CEU) | Clemson | SC | Walter A Duncan Field Illinois Valley Regional to Oconee County Regional |
| Mettel Field (CEV) | Connersville | IN | Walter A Duncan Field Illinois Valley Regional to Mettel Field |
| Bob Sikes (CEW) | Crestview | FL | Walter A Duncan Field Illinois Valley Regional to Bob Sikes |
| Kyle-Oakley Field (CEY) | Murray | KY | Walter A Duncan Field Illinois Valley Regional to Kyle-Oakley Field |
| Cortez Municipal (CEZ) | Cortez | CO | Walter A Duncan Field Illinois Valley Regional to Cortez Municipal |
| Coulter Field (CFD) | Bryan | TX | Walter A Duncan Field Illinois Valley Regional to Coulter Field |
| Creston Valley Regional (CFQ) | Creston | BC | Walter A Duncan Field Illinois Valley Regional to Creston Valley Regional |
| Greenlee County (CFT) | Clifton | AZ | Walter A Duncan Field Illinois Valley Regional to Greenlee County |
| Coffeyville Municipal (CFV) | Coffeyville | KS | Walter A Duncan Field Illinois Valley Regional to Coffeyville Municipal |
| Cambridge-Dorchester Regional (CGE) | Cambridge | MD | Walter A Duncan Field Illinois Valley Regional to Cambridge-Dorchester Regional |
| Cuyahoga County (CGF) | Cleveland | OH | Walter A Duncan Field Illinois Valley Regional to Cuyahoga County |
| Cape Girardeau Regional (CGI) | Cape Girardeau | MO | Walter A Duncan Field Illinois Valley Regional to Cape Girardeau Regional |
| College Park Airport (CGS) | College Park | MD | Walter A Duncan Field Illinois Valley Regional to College Park Airport |
| Casa Grande Municipal (CGZ) | Casa Grande | AZ | Walter A Duncan Field Illinois Valley Regional to Casa Grande Municipal |
| Lovell Field (CHA) | Chattanooga | TN | Walter A Duncan Field Illinois Valley Regional to Lovell Field |
| Chickasha Municipal (CHK) | Chickasha | OK | Walter A Duncan Field Illinois Valley Regional to Chickasha Municipal |
| Challis (CHL) | Challis | ID | Walter A Duncan Field Illinois Valley Regional to Challis |
| Charlottesville Albemarle (CHO) | Charlottesville | VA | Walter A Duncan Field Illinois Valley Regional to Charlottesville Albemarle |
| Charleston International (CHS) | Charleston | SC | Walter A Duncan Field Illinois Valley Regional to Charleston International |
| Chiloquin State (CHZ) | Chiloquin | OR | Walter A Duncan Field Illinois Valley Regional to Chiloquin State |
| Chico Municipal (CIC) | Chico | CA | Walter A Duncan Field Illinois Valley Regional to Chico Municipal |
| The Eastern Iowa (CID) | Cedar Rapids | IA | Walter A Duncan Field Illinois Valley Regional to The Eastern Iowa |
| Craig-Moffat (CIG) | Craig | CO | Walter A Duncan Field Illinois Valley Regional to Craig-Moffat |
| Arthur N Neu (CIN) | Carroll | IA | Walter A Duncan Field Illinois Valley Regional to Arthur N Neu |
| Cairo Regional (CIR) | Cairo | IL | Walter A Duncan Field Illinois Valley Regional to Cairo Regional |
| Chippewa County International (CIU) | Sault Ste Marie | MI | Walter A Duncan Field Illinois Valley Regional to Chippewa County International |
| Canouan Jet Port (CIW) | Canouan Isl | | Walter A Duncan Field Illinois Valley Regional to Canouan Jet Port |
| Ciudad Juarez/Abraham Gonzalez Intl (CJS) | Ciudad Juarez | Chi | Walter A Duncan Field Illinois Valley Regional to Ciudad Juarez/Abraham Gonzalez Intl |
| North Central West Virginia (CKB) | Clarksburg | WV | Walter A Duncan Field Illinois Valley Regional to North Central West Virginia |
| Fletcher Field (CKM) | Clarksdale | MS | Walter A Duncan Field Illinois Valley Regional to Fletcher Field |
| Crookston Municipal Kirkwood Field (CKN) | Crookston | MN | Walter A Duncan Field Illinois Valley Regional to Crookston Municipal Kirkwood Field |
| Outlaw Field (CKV) | Clarksville | TN | Walter A Duncan Field Illinois Valley Regional to Outlaw Field |
| Carlsbad/McClellan-Palomar (CLD) | Carlsbad | CA | Walter A Duncan Field Illinois Valley Regional to Carlsbad/McClellan-Palomar |
| Cleveland/Hopkins International (CLE) | Cleveland | OH | Walter A Duncan Field Illinois Valley Regional to Cleveland/Hopkins International |
| New Coalinga Municipal (CLG) | Coalinga | CA | Walter A Duncan Field Illinois Valley Regional to New Coalinga Municipal |
| Clintonville Municipal (CLI) | Clintonville | WI | Walter A Duncan Field Illinois Valley Regional to Clintonville Municipal |
| Clinton Regional (CLK) | Clinton | OK | Walter A Duncan Field Illinois Valley Regional to Clinton Regional |
| Easterwood Field (CLL) | College Station | TX | Walter A Duncan Field Illinois Valley Regional to Easterwood Field |
| William R Fairchild International (CLM) | Port Angeles | WA | Walter A Duncan Field Illinois Valley Regional to William R Fairchild International |
| Colima (CLQ) | Colima | Col | Walter A Duncan Field Illinois Valley Regional to Colima |
| Cliff Hatfield Memorial (CLR) | Calipatria | CA | Walter A Duncan Field Illinois Valley Regional to Cliff Hatfield Memorial |
| Chehalis-Centralia (CLS) | Chehalis | WA | Walter A Duncan Field Illinois Valley Regional to Chehalis-Centralia |
| Charlotte Douglas International (CLT) | Charlotte | NC | Walter A Duncan Field Illinois Valley Regional to Charlotte Douglas International |
| Columbus Municipal (CLU) | Columbus | IN | Walter A Duncan Field Illinois Valley Regional to Columbus Municipal |
| Clearwater Airpark (CLW) | Clearwater | FL | Walter A Duncan Field Illinois Valley Regional to Clearwater Airpark |
| Ciudad Del Carmen (CME) | Ciudad del Carmen | Cam | Walter A Duncan Field Illinois Valley Regional to Ciudad Del Carmen |
| John Glenn International (CMH) | Columbus | OH | Walter A Duncan Field Illinois Valley Regional to John Glenn International |
| University of Illinois-Willard (CMI) | Champaign/Urbana | IL | Walter A Duncan Field Illinois Valley Regional to University of Illinois-Willard |
| Houghton County Memorial (CMX) | Hancock | MI | Walter A Duncan Field Illinois Valley Regional to Houghton County Memorial |
| Sparta/Fort Mccoy (CMY) | Sparta | WI | Walter A Duncan Field Illinois Valley Regional to Sparta/Fort Mccoy |
| Fremont County (CNE) | Canon City | CO | Walter A Duncan Field Illinois Valley Regional to Fremont County |
| Claremont Municipal (CNH) | Claremont | NH | Walter A Duncan Field Illinois Valley Regional to Claremont Municipal |
| Blosser Municipal (CNK) | Concordia | KS | Walter A Duncan Field Illinois Valley Regional to Blosser Municipal |
| Cavern City Air Terminal (CNM) | Carlsbad | NM | Walter A Duncan Field Illinois Valley Regional to Cavern City Air Terminal |
| Chino (CNO) | Chino | CA | Walter A Duncan Field Illinois Valley Regional to Chino |
| Chanute Martin Johnson (CNU) | Chanute | KS | Walter A Duncan Field Illinois Valley Regional to Chanute Martin Johnson |
| Waco Texas State Techical College (CNW) | Waco | TX | Walter A Duncan Field Illinois Valley Regional to Waco Texas State Techical College |
| Canyonlands Field (CNY) | Moab | UT | Walter A Duncan Field Illinois Valley Regional to Canyonlands Field |
| Columbia (COA) | Columbia | CA | Walter A Duncan Field Illinois Valley Regional to Columbia |
| Yellowstone Regional (COD) | Cody | WY | Walter A Duncan Field Illinois Valley Regional to Yellowstone Regional |
| Coeur D'alene/Pappy Boyington Field (COE) | Coeur D'Alene | ID | Walter A Duncan Field Illinois Valley Regional to Coeur D'alene/Pappy Boyington Field |
| Merritt Island (COI) | Merritt Island | FL | Walter A Duncan Field Illinois Valley Regional to Merritt Island |
| Coleman Municipal (COM) | Coleman | TX | Walter A Duncan Field Illinois Valley Regional to Coleman Municipal |
| Concord Municipal (CON) | Concord | NH | Walter A Duncan Field Illinois Valley Regional to Concord Municipal |
| City of Colorado Springs Municipal (COS) | Colorado Springs | CO | Walter A Duncan Field Illinois Valley Regional to City of Colorado Springs Municipal |
| Cotulla-La Salle County (COT) | Cotulla | TX | Walter A Duncan Field Illinois Valley Regional to Cotulla-La Salle County |
| Columbia Regional (COU) | Columbia | MO | Walter A Duncan Field Illinois Valley Regional to Columbia Regional |
| Congo Town (COX) | Andros Island | | Walter A Duncan Field Illinois Valley Regional to Congo Town |
| Exploitsvalley/Botwood (CP2) | Exploits Valley | New | Walter A Duncan Field Illinois Valley Regional to Exploitsvalley/Botwood |
| Campeche/Ignacio Acuna Ongay Intl (CPE) | Campeche | Cam | Walter A Duncan Field Illinois Valley Regional to Campeche/Ignacio Acuna Ongay Intl |
| Compton/Woodley (CPM) | Compton | CA | Walter A Duncan Field Illinois Valley Regional to Compton/Woodley |
| Casper/Natrona County International (CPR) | Casper | WY | Walter A Duncan Field Illinois Valley Regional to Casper/Natrona County International |
| St Louis Downtown (CPS) | Cahokia/St Louis | IL | Walter A Duncan Field Illinois Valley Regional to St Louis Downtown |
| Debert (CQ3) | Debert | NS | Walter A Duncan Field Illinois Valley Regional to Debert |
| Florenceville (CR3) | Florenceville | NB | Walter A Duncan Field Illinois Valley Regional to Florenceville |
| Grand Strand North Myrtle Beach (CRE) | North Myrtle Beach | SC | Walter A Duncan Field Illinois Valley Regional to Grand Strand North Myrtle Beach |
| Jacksonville Executive at Craig (CRG) | Jacksonville | FL | Walter A Duncan Field Illinois Valley Regional to Jacksonville Executive at Craig |
| Colonel Hill (CRI) | Crooked Island | | Walter A Duncan Field Illinois Valley Regional to Colonel Hill |
| Corpus Christi International (CRP) | Corpus Christi | TX | Walter A Duncan Field Illinois Valley Regional to Corpus Christi International |
| C David Campbell Field-Corsicana Municipal (CRS) | Corsicana | TX | Walter A Duncan Field Illinois Valley Regional to C David Campbell Field-Corsicana Municipal |
| Z M Jack Stell Field (CRT) | Crossett | AR | Walter A Duncan Field Illinois Valley Regional to Z M Jack Stell Field |
| Yeager (CRW) | Charleston | WV | Walter A Duncan Field Illinois Valley Regional to Yeager |
| Roscoe Turner (CRX) | Corinth | MS | Walter A Duncan Field Illinois Valley Regional to Roscoe Turner |
| St Stephen (Giddens Memorial) (CS3) | St Stephen | NB | Walter A Duncan Field Illinois Valley Regional to St Stephen (Giddens Memorial) |
| Chipman (CS4) | Chipman | NB | Walter A Duncan Field Illinois Valley Regional to Chipman |
| Columbus Metropolitan (CSG) | Columbus | GA | Walter A Duncan Field Illinois Valley Regional to Columbus Metropolitan |
| Cabo San Lucas International (CSL) | Los Cabos | Baj | Walter A Duncan Field Illinois Valley Regional to Cabo San Lucas International |
| Clinton-Sherman (CSM) | Clinton | OK | Walter A Duncan Field Illinois Valley Regional to Clinton-Sherman |
| Carson City (CSN) | Carson City | NV | Walter A Duncan Field Illinois Valley Regional to Carson City |
| Creston Municipal (CSQ) | Creston | IA | Walter A Duncan Field Illinois Valley Regional to Creston Municipal |
| Crossville Memorial/Whitson Field (CSV) | Crossville | TN | Walter A Duncan Field Illinois Valley Regional to Crossville Memorial/Whitson Field |
| Cut Bank International (CTB) | Cut Bank | MT | Walter A Duncan Field Illinois Valley Regional to Cut Bank International |
| Chester County G O Carlson (CTH) | Coatesville | PA | Walter A Duncan Field Illinois Valley Regional to Chester County G O Carlson |
| Canton Municipal (CTK) | Canton | SD | Walter A Duncan Field Illinois Valley Regional to Canton Municipal |
| Chetumal Intl (CTM) | Chetumal | Qui | Walter A Duncan Field Illinois Valley Regional to Chetumal Intl |
| Cottonwood (CTW) | Cottonwood | AZ | Walter A Duncan Field Illinois Valley Regional to Cottonwood |
| Cortland County-Chase Field (CTX) | Cortland | NY | Walter A Duncan Field Illinois Valley Regional to Cortland County-Chase Field |
| Cross City (CTY) | Cross City | FL | Walter A Duncan Field Illinois Valley Regional to Cross City |
| Clinton-Sampson County (CTZ) | Clinton | NC | Walter A Duncan Field Illinois Valley Regional to Clinton-Sampson County |
| Jim Hamilton L.B. Owens (CUB) | Columbia | SC | Walter A Duncan Field Illinois Valley Regional to Jim Hamilton L.B. Owens |
| Cushing Municipal (CUH) | Cushing | OK | Walter A Duncan Field Illinois Valley Regional to Cushing Municipal |
| Culiacan (CUL) | Culiacan | Sin | Walter A Duncan Field Illinois Valley Regional to Culiacan |
| Cancun International (CUN) | Cancun | Qui | Walter A Duncan Field Illinois Valley Regional to Cancun International |
| Curacao Hato International (CUR) | Curacao | | Walter A Duncan Field Illinois Valley Regional to Curacao Hato International |
| Chihuahua/Gen R Fierro Villalobos (CUU) | Chihuahua | Chi | Walter A Duncan Field Illinois Valley Regional to Chihuahua/Gen R Fierro Villalobos |
| Cincinnati Northern Kentucky International (CVG) | Cincinnati | OH | Walter A Duncan Field Illinois Valley Regional to Cincinnati Northern Kentucky International |
| Cuernavaca/Gen Mariano Matamoros (CVJ) | Cuernavaca | Mor | Walter A Duncan Field Illinois Valley Regional to Cuernavaca/Gen Mariano Matamoros |
| General Pedro J Mendez/Ciudad Victoria Intl (CVM) | Ciudad Victoria | Tam | Walter A Duncan Field Illinois Valley Regional to General Pedro J Mendez/Ciudad Victoria Intl |
| Clovis Municipal (CVN) | Clovis | NM | Walter A Duncan Field Illinois Valley Regional to Clovis Municipal |
| Corvallis Municipal (CVO) | Corvallis | OR | Walter A Duncan Field Illinois Valley Regional to Corvallis Municipal |
| Kings County Municipal (CW3) | Waterville | NS | Walter A Duncan Field Illinois Valley Regional to Kings County Municipal |
| Central Wisconsin (CWA) | Mosinee | WI | Walter A Duncan Field Illinois Valley Regional to Central Wisconsin |
| Chennault International (CWF) | Lake Charles | LA | Walter A Duncan Field Illinois Valley Regional to Chennault International |
| Clinton Municipal (CWI) | Clinton | IA | Walter A Duncan Field Illinois Valley Regional to Clinton Municipal |
| Cochise County (CWX) | Willcox | AZ | Walter A Duncan Field Illinois Valley Regional to Cochise County |
| Calexico International (CXL) | Calexico | CA | Walter A Duncan Field Illinois Valley Regional to Calexico International |
| Conroe North Houston Regional (CXO) | Houston | TX | Walter A Duncan Field Illinois Valley Regional to Conroe North Houston Regional |
| Charles Kirkconnell Intl (CYB) | Cayman Brac | | Walter A Duncan Field Illinois Valley Regional to Charles Kirkconnell Intl |
| Cheyenne Regional/Jerry Olson Field (CYS) | Cheyenne | WY | Walter A Duncan Field Illinois Valley Regional to Cheyenne Regional/Jerry Olson Field |
| Celaya (CYW) | Celaya | Gua | Walter A Duncan Field Illinois Valley Regional to Celaya |
| Clarenville (CZ3) | Clarenville | New | Walter A Duncan Field Illinois Valley Regional to Clarenville |
| Nuevo Chichen Itza (CZA) | Chichen Itza | Yuc | Walter A Duncan Field Illinois Valley Regional to Nuevo Chichen Itza |
| Burlington Executive (CZB) | Burlington | ON | Walter A Duncan Field Illinois Valley Regional to Burlington Executive |
| Cozumel Intl (CZM) | Cozumel | Qui | Walter A Duncan Field Illinois Valley Regional to Cozumel Intl |
| Dimmit County (CZT) | Carrizo Springs | TX | Walter A Duncan Field Illinois Valley Regional to Dimmit County |
| St Andrews/Codroy Valley (DA5) | St Andrews | New | Walter A Duncan Field Illinois Valley Regional to St Andrews/Codroy Valley |
| Daytona Beach International (DAB) | Daytona Beach | FL | Walter A Duncan Field Illinois Valley Regional to Daytona Beach International |
| Barstow-Daggett (DAG) | Daggett | CA | Walter A Duncan Field Illinois Valley Regional to Barstow-Daggett |
| Dallas Love Field (DAL) | Dallas | TX | Walter A Duncan Field Illinois Valley Regional to Dallas Love Field |
| Danville Regional (DAN) | Danville | VA | Walter A Duncan Field Illinois Valley Regional to Danville Regional |
| Dayton International James M Cox (DAY) | Dayton | OH | Walter A Duncan Field Illinois Valley Regional to Dayton International James M Cox |
| Dublin W H Bud Barron (DBN) | Dublin | GA | Walter A Duncan Field Illinois Valley Regional to Dublin W H Bud Barron |
| Dubuque Regional (DBQ) | Dubuque | IA | Walter A Duncan Field Illinois Valley Regional to Dubuque Regional |
| Roseau/Canefield (DCF) | Roseau | | Walter A Duncan Field Illinois Valley Regional to Roseau/Canefield |
| Ragged Islands-Jumento Cays/Duncan Town (DCT) | Ragged Islands | | Walter A Duncan Field Illinois Valley Regional to Ragged Islands-Jumento Cays/Duncan Town |
| Pryor Field Regional (DCU) | Decatur | AL | Walter A Duncan Field Illinois Valley Regional to Pryor Field Regional |
| Dodge City Regional (DDC) | Dodge City | KS | Walter A Duncan Field Illinois Valley Regional to Dodge City Regional |
| Decatur (DEC) | Decatur | IL | Walter A Duncan Field Illinois Valley Regional to Decatur |
| Decorah Municipal (DEH) | Decorah | IA | Walter A Duncan Field Illinois Valley Regional to Decorah Municipal |
| Denver International (DEN) | Denver | CO | Walter A Duncan Field Illinois Valley Regional to Denver International |
| Coleman A Young Municipal (DET) | Detroit | MI | Walter A Duncan Field Illinois Valley Regional to Coleman A Young Municipal |
| Defiance Memorial (DFI) | Defiance | OH | Walter A Duncan Field Illinois Valley Regional to Defiance Memorial |
| Dallas-Fort Worth International (DFW) | Dallas | TX | Walter A Duncan Field Illinois Valley Regional to Dallas-Fort Worth International |
| Douglas Lake (DGF) | Douglas Lake | BC | Walter A Duncan Field Illinois Valley Regional to Douglas Lake |
| Douglas Municipal (DGL) | Douglas | AZ | Walter A Duncan Field Illinois Valley Regional to Douglas Municipal |
| Durango (DGO) | Durango | Dur | Walter A Duncan Field Illinois Valley Regional to Durango |
| Converse County (DGW) | Douglas | WY | Walter A Duncan Field Illinois Valley Regional to Converse County |
| Dothan Regional (DHN) | Dothan | AL | Walter A Duncan Field Illinois Valley Regional to Dothan Regional |
| Dalhart Municipal (DHT) | Dalhart | TX | Walter A Duncan Field Illinois Valley Regional to Dalhart Municipal |
| Dickinson Theodore Roosevelt Regional (DIK) | Dickinson | ND | Walter A Duncan Field Illinois Valley Regional to Dickinson Theodore Roosevelt Regional |
| Clearwater (DJ4) | Clearwater | NB | Walter A Duncan Field Illinois Valley Regional to Clearwater |
| Chautauqua County/Dunkirk (DKK) | Dunkirk | NY | Walter A Duncan Field Illinois Valley Regional to Chautauqua County/Dunkirk |
| Dillingham (DLG) | Dillingham | AK | Walter A Duncan Field Illinois Valley Regional to Dillingham |
| Duluth International (DLH) | Duluth | MN | Walter A Duncan Field Illinois Valley Regional to Duluth International |
| Dillon County Airport (DLL) | Dillon | SD | Walter A Duncan Field Illinois Valley Regional to Dillon County Airport |
| Dillon (DLN) | Dillon | MT | Walter A Duncan Field Illinois Valley Regional to Dillon |
| The Dalles Municipal/Columbia Gorge Regional (DLS) | The Dalles | OR | Walter A Duncan Field Illinois Valley Regional to The Dalles Municipal/Columbia Gorge Regional |
| Deming Municipal (DMN) | Deming | NM | Walter A Duncan Field Illinois Valley Regional to Deming Municipal |
| Sedalia Regional (DMO) | Sedalia | MO | Walter A Duncan Field Illinois Valley Regional to Sedalia Regional |
| Daniel Field (DNL) | Augusta | GA | Walter A Duncan Field Illinois Valley Regional to Daniel Field |
| Dalton Municipal (DNN) | Dalton | GA | Walter A Duncan Field Illinois Valley Regional to Dalton Municipal |
| Denison Municipal (DNS) | Denison | IA | Walter A Duncan Field Illinois Valley Regional to Denison Municipal |
| Vermilion Regional (DNV) | Danville | IL | Walter A Duncan Field Illinois Valley Regional to Vermilion Regional |
| Roseau/Melville Hall/Douglas Charles (DOM) | Roseau | | Walter A Duncan Field Illinois Valley Regional to Roseau/Melville Hall/Douglas Charles |
| Dover AFB (DOV) | Dover | DE | Walter A Duncan Field Illinois Valley Regional to Dover AFB |
| Dupage (DPA) | Chicago | IL | Walter A Duncan Field Illinois Valley Regional to Dupage |
| Drummond Island (DRE) | Drummond Island | MI | Walter A Duncan Field Illinois Valley Regional to Drummond Island |
| Beauregard Regional (DRI) | De Ridder | LA | Walter A Duncan Field Illinois Valley Regional to Beauregard Regional |
| Durango/La Plata County (DRO) | Durango | CO | Walter A Duncan Field Illinois Valley Regional to Durango/La Plata County |
| Del Rio International (DRT) | Del Rio | TX | Walter A Duncan Field Illinois Valley Regional to Del Rio International |
| Destin Executive (DSI) | Destin | FL | Walter A Duncan Field Illinois Valley Regional to Destin Executive |
| Des Moines International (DSM) | Des Moines | IA | Walter A Duncan Field Illinois Valley Regional to Des Moines International |
| Dansville Municipal (DSV) | Dansville | NY | Walter A Duncan Field Illinois Valley Regional to Dansville Municipal |
| Delta Municipal (DTA) | Delta | UT | Walter A Duncan Field Illinois Valley Regional to Delta Municipal |
| Detroit Lakes-Wething Field (DTL) | Detroit Lakes | MN | Walter A Duncan Field Illinois Valley Regional to Detroit Lakes-Wething Field |
| Shreveport Downtown (DTN) | Shreveport | LA | Walter A Duncan Field Illinois Valley Regional to Shreveport Downtown |
| Detroit Metro Wayne County (DTW) | Detroit | MI | Walter A Duncan Field Illinois Valley Regional to Detroit Metro Wayne County |
| Dunnville (DU9) | Dunnville | ON | Walter A Duncan Field Illinois Valley Regional to Dunnville |
| Durant Regional - Eaker Field (DUA) | Durant | OK | Walter A Duncan Field Illinois Valley Regional to Durant Regional - Eaker Field |
| Halliburton Field (DUC) | Duncan | OK | Walter A Duncan Field Illinois Valley Regional to Halliburton Field |
| Bisbee Douglas International (DUG) | Douglas/Bisbee | AZ | Walter A Duncan Field Illinois Valley Regional to Bisbee Douglas International |
| Dubois Regional (DUJ) | DuBois | PA | Walter A Duncan Field Illinois Valley Regional to Dubois Regional |
| Devils Lake Regional (DVL) | Devils Lake | ND | Walter A Duncan Field Illinois Valley Regional to Devils Lake Regional |
| Davenport Municipal (DVN) | Davenport | IA | Walter A Duncan Field Illinois Valley Regional to Davenport Municipal |
| Phoenix Deer Valley (DVT) | Phoenix | AZ | Walter A Duncan Field Illinois Valley Regional to Phoenix Deer Valley |
| David Wayne Hooks Memorial (DWH) | Houston | TX | Walter A Duncan Field Illinois Valley Regional to David Wayne Hooks Memorial |
| Danbury Municipal (DXR) | Danbury | CT | Walter A Duncan Field Illinois Valley Regional to Danbury Municipal |
| Fogo (DY3) | Fogo | New | Walter A Duncan Field Illinois Valley Regional to Fogo |
| Doylestown (DYL) | Doylestown | PA | Walter A Duncan Field Illinois Valley Regional to Doylestown |
| Olds-Didsbury (EA3) | Olds-Didsbury | AB | Walter A Duncan Field Illinois Valley Regional to Olds-Didsbury |
| Hardisty (EA5) | Hardisty | AB | Walter A Duncan Field Illinois Valley Regional to Hardisty |
| Cardston (EA6) | Cardston | AB | Walter A Duncan Field Illinois Valley Regional to Cardston |
| Phifer Airfield (EAN) | Wheatland | WY | Walter A Duncan Field Illinois Valley Regional to Phifer Airfield |
| Kearney Regional (EAR) | Kearney | NE | Walter A Duncan Field Illinois Valley Regional to Kearney Regional |
| Pangborn Memorial (EAT) | Wenatchee | WA | Walter A Duncan Field Illinois Valley Regional to Pangborn Memorial |
| Chippewa Valley Regional (EAU) | Eau Claire | WI | Walter A Duncan Field Illinois Valley Regional to Chippewa Valley Regional |
| Webster City Municipal (EBS) | Webster City | IA | Walter A Duncan Field Illinois Valley Regional to Webster City Municipal |
| Iosco County (ECA) | East Tawas | MI | Walter A Duncan Field Illinois Valley Regional to Iosco County |
| Elizabeth City Regional & Coast Guard Station (ECG) | Elizabeth City | NC | Walter A Duncan Field Illinois Valley Regional to Elizabeth City Regional & Coast Guard Station |
| Northwest Florida Beaches International (ECP) | Panama City | FL | Walter A Duncan Field Illinois Valley Regional to Northwest Florida Beaches International |
| Mondell Field (ECS) | Newcastle | WY | Walter A Duncan Field Illinois Valley Regional to Mondell Field |
| Oyen Municipal (ED3) | Oyen | AB | Walter A Duncan Field Illinois Valley Regional to Oyen Municipal |
| Fox Creek (ED4) | Fox Creek | AB | Walter A Duncan Field Illinois Valley Regional to Fox Creek |
| Taber (ED5) | Taber | AB | Walter A Duncan Field Illinois Valley Regional to Taber |
| Northeastern Regional (EDE) | Edenton | NC | Walter A Duncan Field Illinois Valley Regional to Northeastern Regional |
| El Dorado/Captain Jack Thomas Memorial (EDK) | El Dorado | KS | Walter A Duncan Field Illinois Valley Regional to El Dorado/Captain Jack Thomas Memorial |
| Wabasca (EE5) | Wabasca | AB | Walter A Duncan Field Illinois Valley Regional to Wabasca |
| Needles (EED) | Needles | CA | Walter A Duncan Field Illinois Valley Regional to Needles |
| Dilliant-Hopkins (EEN) | Keene | NH | Walter A Duncan Field Illinois Valley Regional to Dilliant-Hopkins |
| Bow Island (EF3) | Bow Island | AB | Walter A Duncan Field Illinois Valley Regional to Bow Island |
| Airdrie (EF4) | Airdrie | AB | Walter A Duncan Field Illinois Valley Regional to Airdrie |
| Ellington (EFD) | Houston | TX | Walter A Duncan Field Illinois Valley Regional to Ellington |
| Northeast Kingdom International (EFK) | Newport | VT | Walter A Duncan Field Illinois Valley Regional to Northeast Kingdom International |
| Jefferson Municipal (EFW) | Jefferson | IA | Walter A Duncan Field Illinois Valley Regional to Jefferson Municipal |
| Lacombe (EG3) | Lacombe | AB | Walter A Duncan Field Illinois Valley Regional to Lacombe |
| Drumheller Municipal (EG4) | Drumheller | AB | Walter A Duncan Field Illinois Valley Regional to Drumheller Municipal |
| Eagle County Regional (EGE) | Eagle | CO | Walter A Duncan Field Illinois Valley Regional to Eagle County Regional |
| Maverick County Memorial International (EGP) | Eagle Pass | TX | Walter A Duncan Field Illinois Valley Regional to Maverick County Memorial International |
| Eagle River Union (EGV) | Eagle River | WI | Walter A Duncan Field Illinois Valley Regional to Eagle River Union |
| Ponoka Industrial (EH3) | Ponoka | AB | Walter A Duncan Field Illinois Valley Regional to Ponoka Industrial |
| South Calgary (EH4) | De Winton | AB | Walter A Duncan Field Illinois Valley Regional to South Calgary |
| Red Earth Creek (EH5) | Red Earth | AB | Walter A Duncan Field Illinois Valley Regional to Red Earth Creek |
| Provost (EH6) | Provost | AB | Walter A Duncan Field Illinois Valley Regional to Provost |
| R Terrance B Lettsome Intl (EIS) | Tortola | | Walter A Duncan Field Illinois Valley Regional to R Terrance B Lettsome Intl |
| Stettler (EJ3) | Stettler | AB | Walter A Duncan Field Illinois Valley Regional to Stettler |
| Claresholm Industrial (EJ4) | Claresholm | AB | Walter A Duncan Field Illinois Valley Regional to Claresholm Industrial |
| Elk Point (EJ6) | Elk Point | AB | Walter A Duncan Field Illinois Valley Regional to Elk Point |
| Eureka/Murray Field (EKA) | Eureka | CA | Walter A Duncan Field Illinois Valley Regional to Eureka/Murray Field |
| Elkhart Municipal (EKI) | Elkhart | IN | Walter A Duncan Field Illinois Valley Regional to Elkhart Municipal |
| Elkins/Randolph County (EKN) | Elkins | WV | Walter A Duncan Field Illinois Valley Regional to Elkins/Randolph County |
| Elko Regional/Harris Field (EKO) | Elko | NV | Walter A Duncan Field Illinois Valley Regional to Elko Regional/Harris Field |
| Addington Field (EKX) | Elizabethtown | KY | Walter A Duncan Field Illinois Valley Regional to Addington Field |
| Hanna (EL4) | Hanna | AB | Walter A Duncan Field Illinois Valley Regional to Hanna |
| Valleyview (EL5) | Valleyview | AB | Walter A Duncan Field Illinois Valley Regional to Valleyview |
| Eagle Lake (ELA) | Eagle Lake | TX | Walter A Duncan Field Illinois Valley Regional to Eagle Lake |
| South Arkansas Regional at Goodwin Field (ELD) | El Dorado | AR | Walter A Duncan Field Illinois Valley Regional to South Arkansas Regional at Goodwin Field |
| North Eleuthera (ELH) | Eleuthera Island | | Walter A Duncan Field Illinois Valley Regional to North Eleuthera |
| Elk City Regional Business (ELK) | Elk City | OK | Walter A Duncan Field Illinois Valley Regional to Elk City Regional Business |
| Elmira/Corning Regional (ELM) | Elmira | NY | Walter A Duncan Field Illinois Valley Regional to Elmira/Corning Regional |
| Bowers Field (ELN) | Ellensburg | WA | Walter A Duncan Field Illinois Valley Regional to Bowers Field |
| El Paso International (ELP) | El Paso | TX | Walter A Duncan Field Illinois Valley Regional to El Paso International |
| Ely/Yelland Field (ELY) | Ely | NV | Walter A Duncan Field Illinois Valley Regional to Ely/Yelland Field |
| Wellsville Municipal/Tarantine Field (ELZ) | Wellsville | NY | Walter A Duncan Field Illinois Valley Regional to Wellsville Municipal/Tarantine Field |
| Innisfail (EM4) | Innisfail | AB | Walter A Duncan Field Illinois Valley Regional to Innisfail |
| Swan Hills (EM5) | Swan Hills | AB | Walter A Duncan Field Illinois Valley Regional to Swan Hills |
| Kemmerer Municipal (EMM) | Kemmerer | WY | Walter A Duncan Field Illinois Valley Regional to Kemmerer Municipal |
| Emporia Municipal (EMP) | Emporia | KS | Walter A Duncan Field Illinois Valley Regional to Emporia Municipal |
| San Gabriel Valley (EMT) | El Monte | CA | Walter A Duncan Field Illinois Valley Regional to San Gabriel Valley |
| Three Hills (EN3) | Three Hills | AB | Walter A Duncan Field Illinois Valley Regional to Three Hills |
| High River (EN4) | High River | AB | Walter A Duncan Field Illinois Valley Regional to High River |
| Cold Lake Regional (EN5) | Cold Lake | AB | Walter A Duncan Field Illinois Valley Regional to Cold Lake Regional |
| Kenai Municipal (ENA) | Kenai | AK | Walter A Duncan Field Illinois Valley Regional to Kenai Municipal |
| Centralia Municipal (ENL) | Centralia | IL | Walter A Duncan Field Illinois Valley Regional to Centralia Municipal |
| Nenana Municipal (ENN) | Nenana | AK | Walter A Duncan Field Illinois Valley Regional to Nenana Municipal |
| Wendover (ENV) | Wendover | UT | Walter A Duncan Field Illinois Valley Regional to Wendover |
| Kenosha Regional (ENW) | Kenosha | WI | Walter A Duncan Field Illinois Valley Regional to Kenosha Regional |
| Keokuk Municipal (EOK) | Keokuk | IA | Walter A Duncan Field Illinois Valley Regional to Keokuk Municipal |
| Neosho Hugh Robinson (EOS) | Neosho | MO | Walter A Duncan Field Illinois Valley Regional to Neosho Hugh Robinson |
| Barrhead (EP3) | Barrhead | AB | Walter A Duncan Field Illinois Valley Regional to Barrhead |
| Ephrata Municipal (EPH) | Ephrata | WA | Walter A Duncan Field Illinois Valley Regional to Ephrata Municipal |
| Camrose (EQ3) | Camrose | AB | Walter A Duncan Field Illinois Valley Regional to Camrose |
| Castor (ER2) | Castor | AB | Walter A Duncan Field Illinois Valley Regional to Castor |
| Erie International/Tom Ridge Field (ERI) | Erie | PA | Walter A Duncan Field Illinois Valley Regional to Erie International/Tom Ridge Field |
| Kerrville Municipal/Louis Schreiner Field (ERV) | Kerrville | TX | Walter A Duncan Field Illinois Valley Regional to Kerrville Municipal/Louis Schreiner Field |
| Westlock (ES4) | Westlock | AB | Walter A Duncan Field Illinois Valley Regional to Westlock |
| Delta County (ESC) | Escanaba | MI | Walter A Duncan Field Illinois Valley Regional to Delta County |
| Orcas Island Airport (ESD) | Eastsound | WA | Walter A Duncan Field Illinois Valley Regional to Orcas Island Airport |
| Ensenada/Gen Alberto Salinas (ESE) | Ensenada | Baj | Walter A Duncan Field Illinois Valley Regional to Ensenada/Gen Alberto Salinas |
| Esler Regional (ESF) | Alexandria | LA | Walter A Duncan Field Illinois Valley Regional to Esler Regional |
| Easton/Newnam Field (ESN) | Easton | MD | Walter A Duncan Field Illinois Valley Regional to Easton/Newnam Field |
| Ohkay Owingeh (ESO) | Espanola | NM | Walter A Duncan Field Illinois Valley Regional to Ohkay Owingeh |
| Stroudsburg-Pocono (ESP) | East Stroudsburg | PA | Walter A Duncan Field Illinois Valley Regional to Stroudsburg-Pocono |
| Estherville Municipal (EST) | Estherville | IA | Walter A Duncan Field Illinois Valley Regional to Estherville Municipal |
| West Bend Municipal (ETB) | West Bend | WI | Walter A Duncan Field Illinois Valley Regional to West Bend Municipal |
| Eastland Municipal (ETN) | Eastland | TX | Walter A Duncan Field Illinois Valley Regional to Eastland Municipal |
| Enterprise Municipal (ETS) | Enterprise | AL | Walter A Duncan Field Illinois Valley Regional to Enterprise Municipal |
| Beaverlodge (EU2) | Beaverlodge | AB | Walter A Duncan Field Illinois Valley Regional to Beaverlodge |
| Eureka (EUE) | Eureka | NV | Walter A Duncan Field Illinois Valley Regional to Eureka |
| Weedon Field (EUF) | Eufaula | AL | Walter A Duncan Field Illinois Valley Regional to Weedon Field |
| Mahlon Sweet Field (EUG) | Eugene | OR | Walter A Duncan Field Illinois Valley Regional to Mahlon Sweet Field |
| Vegreville (EV3) | Vegreville | AB | Walter A Duncan Field Illinois Valley Regional to Vegreville |
| Mayerthorpe (EV5) | Mayerthorpe | AB | Walter A Duncan Field Illinois Valley Regional to Mayerthorpe |
| Tofield (EV7) | Tofield | AB | Walter A Duncan Field Illinois Valley Regional to Tofield |
| Eveleth-Virginia Municipal (EVM) | Eveleth | MN | Walter A Duncan Field Illinois Valley Regional to Eveleth-Virginia Municipal |
| Evansville Regional (EVV) | Evansville | IN | Walter A Duncan Field Illinois Valley Regional to Evansville Regional |
| Evanston-Uinta County Burns Field (EVW) | Evanston | WY | Walter A Duncan Field Illinois Valley Regional to Evanston-Uinta County Burns Field |
| Saint Paul (EW3) | St Paul | AB | Walter A Duncan Field Illinois Valley Regional to Saint Paul |
| New Bedford Regional (EWB) | New Bedford | MA | Walter A Duncan Field Illinois Valley Regional to New Bedford Regional |
| Newton City County (EWK) | Newton | KS | Walter A Duncan Field Illinois Valley Regional to Newton City County |
| Coastal Carolina Regional (EWN) | New Bern | NC | Walter A Duncan Field Illinois Valley Regional to Coastal Carolina Regional |
| Newark Liberty International (EWR) | Newark | NJ | Walter A Duncan Field Illinois Valley Regional to Newark Liberty International |
| Wetaskiwin Regional (EX3) | Wetaskiwin | AB | Walter A Duncan Field Illinois Valley Regional to Wetaskiwin Regional |
| Fort Macleod (EY3) | Fort Macleod | AB | Walter A Duncan Field Illinois Valley Regional to Fort Macleod |
| Yerington Municipal (EYR) | Yerington | NV | Walter A Duncan Field Illinois Valley Regional to Yerington Municipal |
| Key West International (EYW) | Key West | FL | Walter A Duncan Field Illinois Valley Regional to Key West International |
| Fort Vermilion (EZ4) | Fort Vermilion | AB | Walter A Duncan Field Illinois Valley Regional to Fort Vermilion |
| Fairbanks International (FAI) | Fairbanks | AK | Walter A Duncan Field Illinois Valley Regional to Fairbanks International |
| Farmington Regional (FAM) | Farmington | MO | Walter A Duncan Field Illinois Valley Regional to Farmington Regional |
| Hector International Fargo (FAR) | Fargo | ND | Walter A Duncan Field Illinois Valley Regional to Hector International Fargo |
| Fresno Yosemite International (FAT) | Fresno | CA | Walter A Duncan Field Illinois Valley Regional to Fresno Yosemite International |
| Fayetteville Regional/Grannis Field (FAY) | Fayetteville | NC | Walter A Duncan Field Illinois Valley Regional to Fayetteville Regional/Grannis Field |
| Warren Thomas Josephburg (FB6) | Edmonton | AB | Walter A Duncan Field Illinois Valley Regional to Warren Thomas Josephburg |
| Faribault Municipal (FBL) | Faribault | MN | Walter A Duncan Field Illinois Valley Regional to Faribault Municipal |
| Fort Bridger Airport (FBR) | Fort Bridger | WY | Walter A Duncan Field Illinois Valley Regional to Fort Bridger Airport |
| Fairbury Municipal (FBY) | Fairbury | NE | Walter A Duncan Field Illinois Valley Regional to Fairbury Municipal |
| Glacier Park International (FCA) | Kalispell | MT | Walter A Duncan Field Illinois Valley Regional to Glacier Park International |
| Fresno Chandler Executive (FCH) | Fresno | CA | Walter A Duncan Field Illinois Valley Regional to Fresno Chandler Executive |
| Flying Cloud (FCM) | Minneapolis | MN | Walter A Duncan Field Illinois Valley Regional to Flying Cloud |
| Forrest City Municipal (FCY) | Forrest City | AR | Walter A Duncan Field Illinois Valley Regional to Forrest City Municipal |
| Foremost (FD4) | Foremost | AB | Walter A Duncan Field Illinois Valley Regional to Foremost |
| Fort de France/Martinique Aimé Césaire Intl (FDF) | Fort-de-France | | Walter A Duncan Field Illinois Valley Regional to Fort de France/Martinique Aimé Césaire Intl |
| Frederick Municipal (FDK) | Frederick | MD | Walter A Duncan Field Illinois Valley Regional to Frederick Municipal |
| Frederick Regional (FDR) | Frederick | OK | Walter A Duncan Field Illinois Valley Regional to Frederick Regional |
| Findlay (FDY) | Findlay | OH | Walter A Duncan Field Illinois Valley Regional to Findlay |
| Albertus (FEP) | Freeport | IL | Walter A Duncan Field Illinois Valley Regional to Albertus |
| Fremont Municipal (FET) | Fremont | NE | Walter A Duncan Field Illinois Valley Regional to Fremont Municipal |
| First Flight (FFA) | Kill Devil Hills | NC | Walter A Duncan Field Illinois Valley Regional to First Flight |
| Fairfield Municipal (FFL) | Fairfield | IA | Walter A Duncan Field Illinois Valley Regional to Fairfield Municipal |
| Fergus Falls Municipal-Einar Mickelson Field (FFM) | Fergus Falls | MN | Walter A Duncan Field Illinois Valley Regional to Fergus Falls Municipal-Einar Mickelson Field |
| Capital City (FFT) | Frankfort | KY | Walter A Duncan Field Illinois Valley Regional to Capital City |
| Consort (FG3) | Consort | AB | Walter A Duncan Field Illinois Valley Regional to Consort |
| Fox Harbour (FH4) | Fox Harbour | NS | Walter A Duncan Field Illinois Valley Regional to Fox Harbour |
| Sierra Vista Municipal/Libby AAF (FHU) | Fort Huachuca | AZ | Walter A Duncan Field Illinois Valley Regional to Sierra Vista Municipal/Libby AAF |
| Elizabeth Field Airport (FID) | Fishers Island | NY | Walter A Duncan Field Illinois Valley Regional to Elizabeth Field Airport |
| Fillmore Municipal (FIL) | Fillmore | UT | Walter A Duncan Field Illinois Valley Regional to Fillmore Municipal |
| Venango Regional (FKL) | Franklin | PA | Walter A Duncan Field Illinois Valley Regional to Venango Regional |
| Franklin Municipal-John Beverly Rose (FKN) | Franklin | VA | Walter A Duncan Field Illinois Valley Regional to Franklin Municipal-John Beverly Rose |
| Empress (FL2) | Empress | AB | Walter A Duncan Field Illinois Valley Regional to Empress |
| Fond Du Lac County (FLD) | Fond Du Lac | WI | Walter A Duncan Field Illinois Valley Regional to Fond Du Lac County |
| Flagstaff Pulliam (FLG) | Flagstaff | AZ | Walter A Duncan Field Illinois Valley Regional to Flagstaff Pulliam |
| Fort Lauderdale Hollywood International (FLL) | Fort Lauderdale | FL | Walter A Duncan Field Illinois Valley Regional to Fort Lauderdale Hollywood International |
| Florence Regional (FLO) | Florence | SC | Walter A Duncan Field Illinois Valley Regional to Florence Regional |
| Marion County Regional (FLP) | Flippin | AR | Walter A Duncan Field Illinois Valley Regional to Marion County Regional |
| Sherman Army Airfield (FLV) | Fort Leavenworth | KS | Walter A Duncan Field Illinois Valley Regional to Sherman Army Airfield |
| Fallon Municipal (FLX) | Fallon | NV | Walter A Duncan Field Illinois Valley Regional to Fallon Municipal |
| Fort Meade (Odenton) Tipton (FME) | Fort Meade Odenton | MD | Walter A Duncan Field Illinois Valley Regional to Fort Meade (Odenton) Tipton |
| Four Corners Regional (FMN) | Farmington | NM | Walter A Duncan Field Illinois Valley Regional to Four Corners Regional |
| Fort Madison Municipal (FMS) | Fort Madison | IA | Walter A Duncan Field Illinois Valley Regional to Fort Madison Municipal |
| Page Field (FMY) | Fort Myers | FL | Walter A Duncan Field Illinois Valley Regional to Page Field |
| Northern Colorado Regional (FNL) | Ft Collins/Loveland | CO | Walter A Duncan Field Illinois Valley Regional to Northern Colorado Regional |
| Bishop International (FNT) | Flint | MI | Walter A Duncan Field Illinois Valley Regional to Bishop International |
| Fort Dodge Regional (FOD) | Fort Dodge | IA | Walter A Duncan Field Illinois Valley Regional to Fort Dodge Regional |
| Topeka Regional (FOE) | Topeka | KS | Walter A Duncan Field Illinois Valley Regional to Topeka Regional |
| Francis S Gabreski (FOK) | Westhampton Beach | NY | Walter A Duncan Field Illinois Valley Regional to Francis S Gabreski |
| Grand Bahama International (FPO) | Freeport | | Walter A Duncan Field Illinois Valley Regional to Grand Bahama International |
| Treasure Coast International (FPR) | Fort Pierce | FL | Walter A Duncan Field Illinois Valley Regional to Treasure Coast International |
| Perry-Foley (FPY) | Perry | FL | Walter A Duncan Field Illinois Valley Regional to Perry-Foley |
| Friday Harbor (FRD) | Friday Harbor | WA | Walter A Duncan Field Illinois Valley Regional to Friday Harbor |
| Republic Long Island (FRG) | Farmingdale | NY | Walter A Duncan Field Illinois Valley Regional to Republic Long Island |
| French Lick Municipal (FRH) | French Lick | IN | Walter A Duncan Field Illinois Valley Regional to French Lick Municipal |
| Fairmont Municipal (FRM) | Fairmont | MN | Walter A Duncan Field Illinois Valley Regional to Fairmont Municipal |
| Front Royal-Warren County (FRR) | Front Royal | VA | Walter A Duncan Field Illinois Valley Regional to Front Royal-Warren County |
| Eastern Slopes Regional (FRY) | Fryeburg | ME | Walter A Duncan Field Illinois Valley Regional to Eastern Slopes Regional |
| Loon River (FS6) | Loon River | AB | Walter A Duncan Field Illinois Valley Regional to Loon River |
| Sioux Falls Regional, Joe Foss Field (FSD) | Sioux Falls | SD | Walter A Duncan Field Illinois Valley Regional to Sioux Falls Regional, Joe Foss Field |
| Fort Scott Municipal (FSK) | Fort Scott | KS | Walter A Duncan Field Illinois Valley Regional to Fort Scott Municipal |
| Fort Smith Regional (FSM) | Fort Smith | AR | Walter A Duncan Field Illinois Valley Regional to Fort Smith Regional |
| Fort Stockton-Pecos County (FST) | Fort Stockton | TX | Walter A Duncan Field Illinois Valley Regional to Fort Stockton-Pecos County |
| Fort Sumner Municipal (FSU) | Fort Sumner | NM | Walter A Duncan Field Illinois Valley Regional to Fort Sumner Municipal |
| Zama Lake (FT9) | Zama Lake | AB | Walter A Duncan Field Illinois Valley Regional to Zama Lake |
| Fort Worth Meacham International (FTW) | Fort Worth | TX | Walter A Duncan Field Illinois Valley Regional to Fort Worth Meacham International |
| Fulton County/Brown Field (FTY) | Atlanta | GA | Walter A Duncan Field Illinois Valley Regional to Fulton County/Brown Field |
| Fullerton Municipal (FUL) | Fullerton | CA | Walter A Duncan Field Illinois Valley Regional to Fullerton Municipal |
| Fort Wayne International (FWA) | Fort Wayne | IN | Walter A Duncan Field Illinois Valley Regional to Fort Wayne International |
| Branson West Municipal - Emerson Field (FWB) | Branson West | MO | Walter A Duncan Field Illinois Valley Regional to Branson West Municipal - Emerson Field |
| Okotoks Air Ranch (FX2) | Calgary | AB | Walter A Duncan Field Illinois Valley Regional to Okotoks Air Ranch |
| Manning Municipal (FX4) | Manning | AB | Walter A Duncan Field Illinois Valley Regional to Manning Municipal |
| Fort Lauderdale Executive (FXE) | Fort Lauderdale | FL | Walter A Duncan Field Illinois Valley Regional to Fort Lauderdale Executive |
| Forest City Municipal (FXY) | Forest City | IA | Walter A Duncan Field Illinois Valley Regional to Forest City Municipal |
| Fayetteville Municipal (FYM) | Fayetteville | TN | Walter A Duncan Field Illinois Valley Regional to Fayetteville Municipal |
| Drake Field (FYV) | Fayetteville | AR | Walter A Duncan Field Illinois Valley Regional to Drake Field |
| Northeast Alabama Regional (GAD) | Gadsden | AL | Walter A Duncan Field Illinois Valley Regional to Northeast Alabama Regional |
| Gage (GAG) | Gage | OK | Walter A Duncan Field Illinois Valley Regional to Gage |
| Montgomery County Airpark (GAI) | Gaithersburg | MD | Walter A Duncan Field Illinois Valley Regional to Montgomery County Airpark |
| Edward G Pitka Sr (GAL) | Galena | AK | Walter A Duncan Field Illinois Valley Regional to Edward G Pitka Sr |
| Great Bend Municipal (GBD) | Great Bend | KS | Walter A Duncan Field Illinois Valley Regional to Great Bend Municipal |
| Galesburg Municipal (GBG) | Galesburg | IL | Walter A Duncan Field Illinois Valley Regional to Galesburg Municipal |
| Gillette-Campbell County (GCC) | Gillette | WY | Walter A Duncan Field Illinois Valley Regional to Gillette-Campbell County |
| Grand Coulee Dam (GCD) | Electric City | WA | Walter A Duncan Field Illinois Valley Regional to Grand Coulee Dam |
| Garden City Regional (GCK) | Garden City | KS | Walter A Duncan Field Illinois Valley Regional to Garden City Regional |
| Grand Cayman/Owen Roberts Intl (GCM) | Grand Cayman | | Walter A Duncan Field Illinois Valley Regional to Grand Cayman/Owen Roberts Intl |
| Grand Canyon National Park (GCN) | Grand Canyon | AZ | Walter A Duncan Field Illinois Valley Regional to Grand Canyon National Park |
| Greeneville-Greene County Municipal (GCY) | Greeneville | TN | Walter A Duncan Field Illinois Valley Regional to Greeneville-Greene County Municipal |
| Donaldson Field (GDC) | Greenville | SC | Walter A Duncan Field Illinois Valley Regional to Donaldson Field |
| Guadalajara/Don Miguel Hidalgo y Costilla (GDL) | Guadalajara | Jal | Walter A Duncan Field Illinois Valley Regional to Guadalajara/Don Miguel Hidalgo y Costilla |
| Gardner Municipal (GDM) | Gardner | MA | Walter A Duncan Field Illinois Valley Regional to Gardner Municipal |
| Grand Turk (Jags Mccartney) Intl ( |
