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