| Invermere (AA8) | Invermere | BC | Trona to Invermere |
| Apalachicola Regional (AAF) | Apalachicola | FL | Trona to Apalachicola Regional |
| Lehigh Valley International (ABE) | Allentown | PA | Trona to Lehigh Valley International |
| Abilene Regional (ABI) | Abilene | TX | Trona to Abilene Regional |
| Albuquerque/Sunport International (ABQ) | Albuquerque | NM | Trona to Albuquerque/Sunport International |
| Aberdeen Regional (ABR) | Aberdeen | SD | Trona to Aberdeen Regional |
| Southwest Georgia Regional (ABY) | Albany | GA | Trona to Southwest Georgia Regional |
| Gen Juan Alvarez International (ACA) | Acapulco | Gue | Trona to Gen Juan Alvarez International |
| Antrim County (ACB) | Bellaire | MI | Trona to Antrim County |
| Nantucket Memorial (ACK) | Nantucket | MA | Trona to Nantucket Memorial |
| Ciudad Acuna International (ACN) | Ciudad Acuna | Coa | Trona to Ciudad Acuna International |
| Waco Regional (ACT) | Waco | TX | Trona to Waco Regional |
| California Redwood Coast-Humboldt County (ACV) | Arcata | CA | Trona to California Redwood Coast-Humboldt County |
| Atlantic City International (ACY) | Atlantic City | NJ | Trona to Atlantic City International |
| Lenawee County (ADG) | Adrian | MI | Trona to Lenawee County |
| Ardmore Municipal (ADM) | Ardmore | OK | Trona to Ardmore Municipal |
| Kodiak (ADQ) | Kodiak | AK | Trona to Kodiak |
| Addison/Dallas (ADS) | Dallas | TX | Trona to Addison/Dallas |
| Ada Municipal (ADT) | Ada | OK | Trona to Ada Municipal |
| Albert Lea Municipal (AEL) | Albert Lea | MN | Trona to Albert Lea Municipal |
| Alexandria International (AEX) | Alexandria | LA | Trona to Alexandria International |
| Afton Municipal (AFO) | Afton | WY | Trona to Afton Municipal |
| Fort Worth Alliance (AFW) | Fort Worth | TX | Trona to Fort Worth Alliance |
| Allegheny County (AGC) | Pittsburgh | PA | Trona to Allegheny County |
| Magnolia Municipal (AGO) | Magnolia | AR | Trona to Magnolia Municipal |
| Augusta Regional/Bush Field (AGS) | Augusta | GA | Trona to Augusta Regional/Bush Field |
| Aguascalientes/Jesus Teran Intl (AGU) | Aguascalientes | Agu | Trona to Aguascalientes/Jesus Teran Intl |
| Ardmore Downtown Executive (AHD) | Ardmore | OK | Trona to Ardmore Downtown Executive |
| Arapahoe Municipal (AHF) | Arapahoe | NE | Trona to Arapahoe Municipal |
| Amery Municipal (AHH) | Amery | WI | Trona to Amery Municipal |
| Ashland Municipal-Sumner Parker Field (AHM) | Ashland | OR | Trona to Ashland Municipal-Sumner Parker Field |
| Athens/Ben Epps (AHN) | Athens | GA | Trona to Athens/Ben Epps |
| Alliance Municipal (AIA) | Alliance | NE | Trona to Alliance Municipal |
| Anderson Municipal-Darlington Field (AID) | Anderson | IN | Trona to Anderson Municipal-Darlington Field |
| Aiken Regional (AIK) | Aiken | SC | Trona to Aiken Regional |
| Atlantic Municipal (AIO) | Atlantic | IA | Trona to Atlantic Municipal |
| George Downer (AIV) | Aliceville | AL | Trona to George Downer |
| Lee C Fine Memorial (AIZ) | KAISER/LAKE OZARK | MO | Trona to Lee C Fine Memorial |
| Cayley/A J Flying Ranch (AJ7) | Cayley | AB | Trona to Cayley/A J Flying Ranch |
| Akron Fulton International (AKC) | Akron | OH | Trona to Akron Fulton International |
| King Salmon (AKN) | King Salmon | AK | Trona to King Salmon |
| Colorado Plains Regional (AKO) | Akron | CO | Trona to Colorado Plains Regional |
| Fort Mackay (AL4) | Albian | AB | Trona to Fort Mackay |
| Albany International (ALB) | Albany | NY | Trona to Albany International |
| Alpine-Casparis Municipal (ALE) | Alpine | TX | Trona to Alpine-Casparis Municipal |
| Alice International (ALI) | Alice | TX | Trona to Alice International |
| Alamogordo White Sands Regional (ALM) | Alamogordo | NM | Trona to Alamogordo White Sands Regional |
| St Louis Regional (ALN) | Alton | IL | Trona to St Louis Regional |
| Waterloo Regional (ALO) | Waterloo | IA | Trona to Waterloo Regional |
| San Luis Valley Regional/Bergman Field (ALS) | Alamosa | CO | Trona to San Luis Valley Regional/Bergman Field |
| Walla Walla Regional (ALW) | Walla Walla | WA | Trona to Walla Walla Regional |
| Thomas C Russell Field (ALX) | Alexander City | AL | Trona to Thomas C Russell Field |
| Rick Husband Amarillo International (AMA) | Amarillo | TX | Trona to Rick Husband Amarillo International |
| Animas Air Park (AMK) | Durango | CO | Trona to Animas Air Park |
| Gratiot Community (AMN) | Alma | MI | Trona to Gratiot Community |
| Ames Municipal (AMW) | Ames | IA | Trona to Ames Municipal |
| Anniston Regional (ANB) | Anniston | AL | Trona to Anniston Regional |
| Ted Stevens Anchorage International (ANC) | Anchorage | AK | Trona to Ted Stevens Anchorage International |
| Anderson Regional (AND) | Anderson | SC | Trona to Anderson Regional |
| Aniak (ANI) | Aniak | AK | Trona to Aniak |
| Tri-State Steuben County (ANQ) | Angola | IN | Trona to Tri-State Steuben County |
| Ainsworth Regional (ANW) | Ainsworth | NE | Trona to Ainsworth Regional |
| Anthony Municipal (ANY) | Anthony | KS | Trona to Anthony Municipal |
| Lima Allen County (AOH) | Lima | OH | Trona to Lima Allen County |
| Altoona/Blair County (AOO) | Altoona | PA | Trona to Altoona/Blair County |
| Centennial (APA) | Denver | CO | Trona to Centennial |
| Napa County (APC) | Napa | CA | Trona to Napa County |
| Naples Municipal (APF) | Naples | FL | Trona to Naples Municipal |
| Alpena County Regional (APN) | Alpena | MI | Trona to Alpena County Regional |
| New Iberia/Acadiana Regional (ARA) | New Iberia | LA | Trona to New Iberia/Acadiana Regional |
| Walnut Ridge Regional (ARG) | Walnut Ridge | AR | Trona to Walnut Ridge Regional |
| Watertown International (ART) | Watertown | NY | Trona to Watertown International |
| Lakeland/Noble F. Lee Memorial Field (ARV) | Minocqua | WI | Trona to Lakeland/Noble F. Lee Memorial Field |
| Aspen-Pitkin County/Sardy Field (ASE) | Aspen | CO | Trona to Aspen-Pitkin County/Sardy Field |
| Nashua-Boire Field (ASH) | Nashua | NH | Trona to Nashua-Boire Field |
| Harrison County (ASL) | Marshall | TX | Trona to Harrison County |
| Talladega Municipal (ASN) | Talladega | AL | Trona to Talladega Municipal |
| Austin (ASQ) | Austin | NV | Trona to Austin |
| Astoria Regional (AST) | Astoria | OR | Trona to Astoria Regional |
| John F Kennedy Memorial (ASX) | Ashland | WI | Trona to John F Kennedy Memorial |
| Ashley Municipal (ASY) | Ashley | ND | Trona to Ashley Municipal |
| Arthur's Town (ATC) | Cat Island | | Trona to Arthur's Town |
| Antlers Municipal (ATE) | Antlers | OK | Trona to Antlers Municipal |
| Hartsfield Jackson Atlanta International (ATL) | Atlanta | GA | Trona to Hartsfield Jackson Atlanta International |
| Gordon K Bush Ohio University (ATO) | Athens/Albany | OH | Trona to Gordon K Bush Ohio University |
| Artesia Municipal (ATS) | Artesia | NM | Trona to Artesia Municipal |
| Appleton International (ATW) | Appleton | WI | Trona to Appleton International |
| Watertown Regional (ATY) | Watertown | SD | Trona to Watertown Regional |
| Oliver (AU3) | Oliver | BC | Trona to Oliver |
| Vanderhoof (AU4) | Vanderhoof | BC | Trona to Vanderhoof |
| Reina Beatrix International (AUA) | Oranjestad | | Trona to Reina Beatrix International |
| Austin Municipal (AUM) | Austin | MN | Trona to Austin Municipal |
| Auburn Municipal (AUN) | Auburn | CA | Trona to Auburn Municipal |
| Auburn University Regional (AUO) | Auburn | AL | Trona to Auburn University Regional |
| Austin Bergstrom International (AUS) | Austin | TX | Trona to Austin Bergstrom International |
| Wausau Downtown (AUW) | Wausau | WI | Trona to Wausau Downtown |
| Chicago/Aurora Municipal (AUZ) | Chicago | IL | Trona to Chicago/Aurora Municipal |
| Asheville Regional (AVL) | Asheville | NC | Trona to Asheville Regional |
| Avon Park Executive (AVO) | Avon Park | FL | Trona to Avon Park Executive |
| Wilkes-Barre/Scranton International (AVP) | Scranton | PA | Trona to Wilkes-Barre/Scranton International |
| Marana Regional (AVW) | Tucson | AZ | Trona to Marana Regional |
| Catalina (AVX) | Avalon | CA | Trona to Catalina |
| West Memphis Municipal (AWM) | West Memphis | AR | Trona to West Memphis Municipal |
| Chandler Field (AXN) | Alexandria | MN | Trona to Chandler Field |
| Altus/Quartz Mountain Regional (AXS) | Altus | OK | Trona to Altus/Quartz Mountain Regional |
| Auglaize County Neil Armstrong (AXV) | Wapakoneta | OH | Trona to Auglaize County Neil Armstrong |
| Angel Fire (Colfax County) (AXX) | Angel Fire | NM | Trona to Angel Fire (Colfax County) |
| Waycross-Ware County (AYS) | Waycross | GA | Trona to Waycross-Ware County |
| Cache Creek (AZ5) | Cache-Creek | BC | Trona to Cache Creek |
| Phoenix-Mesa Gateway (AZA) | Phoenix | AZ | Trona to Phoenix-Mesa Gateway |
| Kalamazoo/Battle Creek International (AZO) | Kalamazoo | MI | Trona to Kalamazoo/Battle Creek International |
| El Catey Presidente Juan Bosch (AZS) | Samana | | Trona to El Catey Presidente Juan Bosch |
| Barnes Municipal (BAF) | Westfield | MA | Trona to Barnes Municipal |
| Battle Mountain (BAM) | Battle Mountain | NV | Trona to Battle Mountain |
| Benson Municipal (BBB) | Benson | MN | Trona to Benson Municipal |
| Bay City Regional (BBC) | Bay City | TX | Trona to Bay City Regional |
| Curtis Field (BBD) | Brady | TX | Trona to Curtis Field |
| Broken Bow Municipal/Keith Glaze Field (BBW) | Broken Bow | NE | Trona to Broken Bow Municipal/Keith Glaze Field |
| Bryce Canyon (BCE) | Bryce Canyon | UT | Trona to Bryce Canyon |
| Boca Raton (BCT) | Boca Raton | FL | Trona to Boca Raton |
| L F Wade Bermuda International (BDA) | Hamilton | | Trona to L F Wade Bermuda International |
| Baudette International (BDE) | Baudette | MN | Trona to Baudette International |
| Blanding Municipal (BDG) | Blanding | UT | Trona to Blanding Municipal |
| Bradley International (BDL) | Windsor Locks | CT | Trona to Bradley International |
| Bandon State (BDY) | Bandon | OR | Trona to Bandon State |
| Beech Factory (BEC) | Wichita | KS | Trona to Beech Factory |
| Laurence G Hanscom Field (BED) | Bedford | MA | Trona to Laurence G Hanscom Field |
| Southwest Michigan Regional (BEH) | Benton Harbor | MI | Trona to Southwest Michigan Regional |
| Bethel (BET) | Bethel | AK | Trona to Bethel |
| Bradford Regional (BFD) | Bradford | PA | Trona to Bradford Regional |
| Western Nebraska Regional/William B Heilig Field (BFF) | Scottsbluff | NE | Trona to Western Nebraska Regional/William B Heilig Field |
| Bullfrog Basin (BFG) | Glen Canyon | UT | Trona to Bullfrog Basin |
| King County International Boeing Field (BFI) | Seattle | WA | Trona to King County International Boeing Field |
| Meadows Field (BFL) | Bakersfield | CA | Trona to Meadows Field |
| Mobile Downtown (BFM) | Mobile | AL | Trona to Mobile Downtown |
| Virgil I Grissom Municipal (BFR) | Bedford | IN | Trona to Virgil I Grissom Municipal |
| Hutchinson County (BGD) | Borger | TX | Trona to Hutchinson County |
| Decatur County Industrial Air Park (BGE) | Bainbridge | GA | Trona to Decatur County Industrial Air Park |
| Greater Binghamton Edwin A Link Field (BGM) | Binghamton | NY | Trona to Greater Binghamton Edwin A Link Field |
| Bangor International (BGR) | Bangor | ME | Trona to Bangor International |
| Bagdad (BGT) | Bagdad | AZ | Trona to Bagdad |
| Birmingham-Shuttlesworth International (BHM) | Birmingham | AL | Trona to Birmingham-Shuttlesworth International |
| Beatrice Municipal (BIE) | Beatrice | NE | Trona to Beatrice Municipal |
| Delta Junction/Fort Greely/Allen AAF (BIG) | Delta Junction | AK | Trona to Delta Junction/Fort Greely/Allen AAF |
| Bishop Regional (BIH) | Bishop | CA | Trona to Bishop Regional |
| Billings Logan International (BIL) | Billings | MT | Trona to Billings Logan International |
| South Bimini (BIM) | Bimini Islands | | Trona to South Bimini |
| Bismarck Municipal (BIS) | Bismarck | ND | Trona to Bismarck Municipal |
| Echo Valley (BJ4) | Echo Valley | BC | Trona to Echo Valley |
| Rocky Mountain Metropolitan/Jeffco (BJC) | Denver | CO | Trona to Rocky Mountain Metropolitan/Jeffco |
| Bemidji Regional (BJI) | Bemidji | MN | Trona to Bemidji Regional |
| Wayne County (BJJ) | Wooster | OH | Trona to Wayne County |
| Leon/Bajio/Guanajuato International (BJX) | Leon | Gua | Trona to Leon/Bajio/Guanajuato International |
| Stephens County (BKD) | Breckenridge | TX | Trona to Stephens County |
| Baker City Municipal (BKE) | Baker City | OR | Trona to Baker City Municipal |
| Branson (BKG) | Branson | MO | Trona to Branson |
| Burke Lakefront (BKL) | Cleveland | OH | Trona to Burke Lakefront |
| Allen C Perkinson Blackstone Army Air Field (BKT) | Blackstone | VA | Trona to Allen C Perkinson Blackstone Army Air Field |
| Raleigh County Memorial (BKW) | Beckley | WV | Trona to Raleigh County Memorial |
| Brookings Regional (BKX) | Brookings | SD | Trona to Brookings Regional |
| Boulder City Municipal (BLD) | Boulder City | NV | Trona to Boulder City Municipal |
| Blythe (BLH) | Blythe | CA | Trona to Blythe |
| Bellingham International (BLI) | Bellingham | WA | Trona to Bellingham International |
| Monmouth Executive (BLM) | Belmar | NJ | Trona to Monmouth Executive |
| Blue Canyon - Nyack (BLU) | Emigrant Gap | CA | Trona to Blue Canyon - Nyack |
| MidAmerica St Louis Scott AFB (BLV) | Belleville | IL | Trona to MidAmerica St Louis Scott AFB |
| Brigham City Regional (BMC) | Brigham City | UT | Trona to Brigham City Regional |
| Monroe County (BMG) | Bloomington | IN | Trona to Monroe County |
| Central Illinois Regional at Bloomington Normal (BMI) | Bloomington | IL | Trona to Central Illinois Regional at Bloomington Normal |
| Beaumont Municipal (BMT) | Beaumont | TX | Trona to Beaumont Municipal |
| Nashville International (BNA) | Nashville | TN | Trona to Nashville International |
| Banning Municipal (BNG) | Banning | CA | Trona to Banning Municipal |
| Barnwell Regional (BNL) | Barnwell | SC | Trona to Barnwell Regional |
| Burns Municipal (BNO) | Burns | OR | Trona to Burns Municipal |
| Boone Municipal (BNW) | Boone | IA | Trona to Boone Municipal |
| Boise Air Terminal Gowen Field (BOI) | Boise | ID | Trona to Boise Air Terminal Gowen Field |
| Brookings Airport (BOK) | Brookings | OR | Trona to Brookings Airport |
| Flamingo (BON) | Bonaire Island | | Trona to Flamingo |
| Boston Logan International (BOS) | Boston | MA | Trona to Boston Logan International |
| Miley Memorial Field (Big Piney) (BPI) | Big Piney | WY | Trona to Miley Memorial Field (Big Piney) |
| Jack Brooks Regional (BPT) | Beaumont/Port Arthur | TX | Trona to Jack Brooks Regional |
| Brunswick Golden Isles (BQK) | Brunswick | GA | Trona to Brunswick Golden Isles |
| Aguadilla/Rafael Hernandez (Borinquen) (BQN) | Aguadilla | | Trona to Aguadilla/Rafael Hernandez (Borinquen) |
| Kaslo (BR2) | Kaslo | BC | Trona to Kaslo |
| Brainerd Lakes Regional (BRD) | Brainerd | MN | Trona to Brainerd Lakes Regional |
| Southeast Iowa Regional (BRL) | Burlington | IA | Trona to Southeast Iowa Regional |
| Brownsville/South Padre Island International (BRO) | Brownsville | TX | Trona to Brownsville/South Padre Island International |
| Samuels Field (BRY) | Bardstown | KY | Trona to Samuels Field |
| Bisbee Municipal (BSQ) | Bisbee | AZ | Trona to Bisbee Municipal |
| Skypark (BTF) | Bountiful | UT | Trona to Skypark |
| Battle Creek Executive (BTL) | Battle Creek | MI | Trona to Battle Creek Executive |
| Bert Mooney (BTM) | Butte | MT | Trona to Bert Mooney |
| Baton Rouge Metro Ryan Field (BTR) | Baton Rouge | LA | Trona to Baton Rouge Metro Ryan Field |
| Burlington International (BTV) | Burlington | VT | Trona to Burlington International |
| Cram Field (BUB) | Burwell | NE | Trona to Cram Field |
| Buffalo Niagara International (BUF) | Buffalo | NY | Trona to Buffalo Niagara International |
| Butler Memorial (BUM) | Butler | MO | Trona to Butler Memorial |
| Hollywood Burbank (BUR) | Burbank | CA | Trona to Hollywood Burbank |
| Bartlesville Municipal (BVO) | Bartlesville | OK | Trona to Bartlesville Municipal |
| Batesville Regional (BVX) | Batesville | AR | Trona to Batesville Regional |
| Brawley Municipal (BWC) | Brawley | CA | Trona to Brawley Municipal |
| Brownwood Regional (BWD) | Brownwood | TX | Trona to Brownwood Regional |
| Bowling Green Warren County Regional (BWG) | Bowling Green | KY | Trona to Bowling Green Warren County Regional |
| Baltimore/Washington Intl Thurgood Marshall (BWI) | Baltimore | MD | Trona to Baltimore/Washington Intl Thurgood Marshall |
| Bowman Municipal (BWM) | Bowman | ND | Trona to Bowman Municipal |
| George R Carr Memorial Airfield (BXA) | Bogalusa | LA | Trona to George R Carr Memorial Airfield |
| Buckeye Municipal (BXK) | Buckeye | AZ | Trona to Buckeye Municipal |
| Borrego Valley (BXS) | Borrego Springs | CA | Trona to Borrego Valley |
| Johnson County (BYG) | Buffalo | WY | Trona to Johnson County |
| Arkansas International (BYH) | Blytheville | AR | Trona to Arkansas International |
| Burley Municipal (BYI) | Burley | ID | Trona to Burley Municipal |
| Bozeman Yellowstone International (BZN) | Bozeman | MT | Trona to Bozeman Yellowstone International |
| Wexford County (CAD) | Cadillac | MI | Trona to Wexford County |
| Columbia Metropolitan (CAE) | Columbia | SC | Trona to Columbia Metropolitan |
| Akron/Canton Regional (CAK) | Akron | OH | Trona to Akron/Canton Regional |
| Clayton Municipal Airpark (CAO) | Clayton | NM | Trona to Clayton Municipal Airpark |
| Cap Haitien (CAP) | Cap Haitien | | Trona to Cap Haitien |
| Council Bluffs Municipal (CBF) | Council Bluffs | IA | Trona to Council Bluffs Municipal |
| Shalz Field (CBK) | Colby | KS | Trona to Shalz Field |
| Clinton Municipal (CCA) | Clinton | AR | Trona to Clinton Municipal |
| Cable (CCB) | Upland | CA | Trona to Cable |
| Crane County (CCG) | Crane | TX | Trona to Crane County |
| Buchanan Field (CCR) | Concord | CA | Trona to Buchanan Field |
| Northeast Iowa Regional (CCY) | Charles City | IA | Trona to Northeast Iowa Regional |
| Cold Bay (CDB) | Cold Bay | AK | Trona to Cold Bay |
| Cedar City Regional (CDC) | Cedar City | UT | Trona to Cedar City Regional |
| Harrell Field (CDH) | Camden | AR | Trona to Harrell Field |
| Woodward Field (CDN) | Camden | SC | Trona to Woodward Field |
| Chadron Municipal (CDR) | Chadron | NE | Trona to Chadron Municipal |
| Childress Municipal (CDS) | Childress | TX | Trona to Childress Municipal |
| Merle K (Mudhole) Smith (CDV) | Cordova | AK | Trona to Merle K (Mudhole) Smith |
| Cessna Aircraft Field (CEA) | Wichita | KS | Trona to Cessna Aircraft Field |
| Del Norte Co Regional/Jack Mcnamara Field (CEC) | Crescent City | CA | Trona to Del Norte Co Regional/Jack Mcnamara Field |
| Westover Arb/Westover Metropolitan (CEF) | Chicopee | MA | Trona to Westover Arb/Westover Metropolitan |
| Ciudad Obregon International (CEN) | Ciudad Obregon | Son | Trona to Ciudad Obregon International |
| Oconee County Regional (CEU) | Clemson | SC | Trona to Oconee County Regional |
| Mettel Field (CEV) | Connersville | IN | Trona to Mettel Field |
| Bob Sikes (CEW) | Crestview | FL | Trona to Bob Sikes |
| Kyle-Oakley Field (CEY) | Murray | KY | Trona to Kyle-Oakley Field |
| Cortez Municipal (CEZ) | Cortez | CO | Trona to Cortez Municipal |
| Coulter Field (CFD) | Bryan | TX | Trona to Coulter Field |
| Creston Valley Regional (CFQ) | Creston | BC | Trona to Creston Valley Regional |
| Greenlee County (CFT) | Clifton | AZ | Trona to Greenlee County |
| Coffeyville Municipal (CFV) | Coffeyville | KS | Trona to Coffeyville Municipal |
| Cuyahoga County (CGF) | Cleveland | OH | Trona to Cuyahoga County |
| Cape Girardeau Regional (CGI) | Cape Girardeau | MO | Trona to Cape Girardeau Regional |
| Casa Grande Municipal (CGZ) | Casa Grande | AZ | Trona to Casa Grande Municipal |
| Lovell Field (CHA) | Chattanooga | TN | Trona to Lovell Field |
| Chickasha Municipal (CHK) | Chickasha | OK | Trona to Chickasha Municipal |
| Challis (CHL) | Challis | ID | Trona to Challis |
| Charlottesville Albemarle (CHO) | Charlottesville | VA | Trona to Charlottesville Albemarle |
| Charleston International (CHS) | Charleston | SC | Trona to Charleston International |
| Chiloquin State (CHZ) | Chiloquin | OR | Trona to Chiloquin State |
| Chico Municipal (CIC) | Chico | CA | Trona to Chico Municipal |
| The Eastern Iowa (CID) | Cedar Rapids | IA | Trona to The Eastern Iowa |
| Craig-Moffat (CIG) | Craig | CO | Trona to Craig-Moffat |
| Arthur N Neu (CIN) | Carroll | IA | Trona to Arthur N Neu |
| Cairo Regional (CIR) | Cairo | IL | Trona to Cairo Regional |
| Chippewa County International (CIU) | Sault Ste Marie | MI | Trona to Chippewa County International |
| Ciudad Juarez/Abraham Gonzalez Intl (CJS) | Ciudad Juarez | Chi | Trona to Ciudad Juarez/Abraham Gonzalez Intl |
| North Central West Virginia (CKB) | Clarksburg | WV | Trona to North Central West Virginia |
| Fletcher Field (CKM) | Clarksdale | MS | Trona to Fletcher Field |
| Crookston Municipal Kirkwood Field (CKN) | Crookston | MN | Trona to Crookston Municipal Kirkwood Field |
| Outlaw Field (CKV) | Clarksville | TN | Trona to Outlaw Field |
| Carlsbad/McClellan-Palomar (CLD) | Carlsbad | CA | Trona to Carlsbad/McClellan-Palomar |
| Cleveland/Hopkins International (CLE) | Cleveland | OH | Trona to Cleveland/Hopkins International |
| New Coalinga Municipal (CLG) | Coalinga | CA | Trona to New Coalinga Municipal |
| Clintonville Municipal (CLI) | Clintonville | WI | Trona to Clintonville Municipal |
| Clinton Regional (CLK) | Clinton | OK | Trona to Clinton Regional |
| Easterwood Field (CLL) | College Station | TX | Trona to Easterwood Field |
| William R Fairchild International (CLM) | Port Angeles | WA | Trona to William R Fairchild International |
| Colima (CLQ) | Colima | Col | Trona to Colima |
| Cliff Hatfield Memorial (CLR) | Calipatria | CA | Trona to Cliff Hatfield Memorial |
| Chehalis-Centralia (CLS) | Chehalis | WA | Trona to Chehalis-Centralia |
| Charlotte Douglas International (CLT) | Charlotte | NC | Trona to Charlotte Douglas International |
| Columbus Municipal (CLU) | Columbus | IN | Trona to Columbus Municipal |
| Ciudad Del Carmen (CME) | Ciudad del Carmen | Cam | Trona to Ciudad Del Carmen |
| John Glenn International (CMH) | Columbus | OH | Trona to John Glenn International |
| University of Illinois-Willard (CMI) | Champaign/Urbana | IL | Trona to University of Illinois-Willard |
| Houghton County Memorial (CMX) | Hancock | MI | Trona to Houghton County Memorial |
| Sparta/Fort Mccoy (CMY) | Sparta | WI | Trona to Sparta/Fort Mccoy |
| Fremont County (CNE) | Canon City | CO | Trona to Fremont County |
| Blosser Municipal (CNK) | Concordia | KS | Trona to Blosser Municipal |
| Cavern City Air Terminal (CNM) | Carlsbad | NM | Trona to Cavern City Air Terminal |
| Chino (CNO) | Chino | CA | Trona to Chino |
| Chanute Martin Johnson (CNU) | Chanute | KS | Trona to Chanute Martin Johnson |
| Waco Texas State Techical College (CNW) | Waco | TX | Trona to Waco Texas State Techical College |
| Canyonlands Field (CNY) | Moab | UT | Trona to Canyonlands Field |
| Columbia (COA) | Columbia | CA | Trona to Columbia |
| Yellowstone Regional (COD) | Cody | WY | Trona to Yellowstone Regional |
| Coeur D'alene/Pappy Boyington Field (COE) | Coeur D'Alene | ID | Trona to Coeur D'alene/Pappy Boyington Field |
| Coleman Municipal (COM) | Coleman | TX | Trona to Coleman Municipal |
| Concord Municipal (CON) | Concord | NH | Trona to Concord Municipal |
| City of Colorado Springs Municipal (COS) | Colorado Springs | CO | Trona to City of Colorado Springs Municipal |
| Cotulla-La Salle County (COT) | Cotulla | TX | Trona to Cotulla-La Salle County |
| Columbia Regional (COU) | Columbia | MO | Trona to Columbia Regional |
| Congo Town (COX) | Andros Island | | Trona to Congo Town |
| Campeche/Ignacio Acuna Ongay Intl (CPE) | Campeche | Cam | Trona to Campeche/Ignacio Acuna Ongay Intl |
| Compton/Woodley (CPM) | Compton | CA | Trona to Compton/Woodley |
| Casper/Natrona County International (CPR) | Casper | WY | Trona to Casper/Natrona County International |
| St Louis Downtown (CPS) | Cahokia/St Louis | IL | Trona to St Louis Downtown |
| Florenceville (CR3) | Florenceville | NB | Trona to Florenceville |
| Grand Strand North Myrtle Beach (CRE) | North Myrtle Beach | SC | Trona to Grand Strand North Myrtle Beach |
| Corpus Christi International (CRP) | Corpus Christi | TX | Trona to Corpus Christi International |
| C David Campbell Field-Corsicana Municipal (CRS) | Corsicana | TX | Trona to C David Campbell Field-Corsicana Municipal |
| Z M Jack Stell Field (CRT) | Crossett | AR | Trona to Z M Jack Stell Field |
| Yeager (CRW) | Charleston | WV | Trona to Yeager |
| Roscoe Turner (CRX) | Corinth | MS | Trona to Roscoe Turner |
| Columbus Metropolitan (CSG) | Columbus | GA | Trona to Columbus Metropolitan |
| Cabo San Lucas International (CSL) | Los Cabos | Baj | Trona to Cabo San Lucas International |
| Clinton-Sherman (CSM) | Clinton | OK | Trona to Clinton-Sherman |
| Carson City (CSN) | Carson City | NV | Trona to Carson City |
| Creston Municipal (CSQ) | Creston | IA | Trona to Creston Municipal |
| Crossville Memorial/Whitson Field (CSV) | Crossville | TN | Trona to Crossville Memorial/Whitson Field |
| Cut Bank International (CTB) | Cut Bank | MT | Trona to Cut Bank International |
| Chester County G O Carlson (CTH) | Coatesville | PA | Trona to Chester County G O Carlson |
| Chetumal Intl (CTM) | Chetumal | Qui | Trona to Chetumal Intl |
| Cottonwood (CTW) | Cottonwood | AZ | Trona to Cottonwood |
| Cross City (CTY) | Cross City | FL | Trona to Cross City |
| Jim Hamilton L.B. Owens (CUB) | Columbia | SC | Trona to Jim Hamilton L.B. Owens |
| Cushing Municipal (CUH) | Cushing | OK | Trona to Cushing Municipal |
| Culiacan (CUL) | Culiacan | Sin | Trona to Culiacan |
| Cancun International (CUN) | Cancun | Qui | Trona to Cancun International |
| Curacao Hato International (CUR) | Curacao | | Trona to Curacao Hato International |
| Chihuahua/Gen R Fierro Villalobos (CUU) | Chihuahua | Chi | Trona to Chihuahua/Gen R Fierro Villalobos |
| Cincinnati Northern Kentucky International (CVG) | Cincinnati | OH | Trona to Cincinnati Northern Kentucky International |
| Cuernavaca/Gen Mariano Matamoros (CVJ) | Cuernavaca | Mor | Trona to Cuernavaca/Gen Mariano Matamoros |
| General Pedro J Mendez/Ciudad Victoria Intl (CVM) | Ciudad Victoria | Tam | Trona to General Pedro J Mendez/Ciudad Victoria Intl |
| Clovis Municipal (CVN) | Clovis | NM | Trona to Clovis Municipal |
| Corvallis Municipal (CVO) | Corvallis | OR | Trona to Corvallis Municipal |
| Central Wisconsin (CWA) | Mosinee | WI | Trona to Central Wisconsin |
| Chennault International (CWF) | Lake Charles | LA | Trona to Chennault International |
| Clinton Municipal (CWI) | Clinton | IA | Trona to Clinton Municipal |
| Cochise County (CWX) | Willcox | AZ | Trona to Cochise County |
| Calexico International (CXL) | Calexico | CA | Trona to Calexico International |
| Conroe North Houston Regional (CXO) | Houston | TX | Trona to Conroe North Houston Regional |
| Charles Kirkconnell Intl (CYB) | Cayman Brac | | Trona to Charles Kirkconnell Intl |
| Cheyenne Regional/Jerry Olson Field (CYS) | Cheyenne | WY | Trona to Cheyenne Regional/Jerry Olson Field |
| Celaya (CYW) | Celaya | Gua | Trona to Celaya |
| Nuevo Chichen Itza (CZA) | Chichen Itza | Yuc | Trona to Nuevo Chichen Itza |
| Boundary Bay (CZBB) | Vancouver | BC | Trona to Boundary Bay |
| Cozumel Intl (CZM) | Cozumel | Qui | Trona to Cozumel Intl |
| Dimmit County (CZT) | Carrizo Springs | TX | Trona to Dimmit County |
| Daytona Beach International (DAB) | Daytona Beach | FL | Trona to Daytona Beach International |
| Dallas Love Field (DAL) | Dallas | TX | Trona to Dallas Love Field |
| Danville Regional (DAN) | Danville | VA | Trona to Danville Regional |
| Dayton International James M Cox (DAY) | Dayton | OH | Trona to Dayton International James M Cox |
| Dublin W H Bud Barron (DBN) | Dublin | GA | Trona to Dublin W H Bud Barron |
| Dubuque Regional (DBQ) | Dubuque | IA | Trona to Dubuque Regional |
| Pryor Field Regional (DCU) | Decatur | AL | Trona to Pryor Field Regional |
| Dodge City Regional (DDC) | Dodge City | KS | Trona to Dodge City Regional |
| Decatur (DEC) | Decatur | IL | Trona to Decatur |
| Decorah Municipal (DEH) | Decorah | IA | Trona to Decorah Municipal |
| Denver International (DEN) | Denver | CO | Trona to Denver International |
| Coleman A Young Municipal (DET) | Detroit | MI | Trona to Coleman A Young Municipal |
| Defiance Memorial (DFI) | Defiance | OH | Trona to Defiance Memorial |
| Dallas-Fort Worth International (DFW) | Dallas | TX | Trona to Dallas-Fort Worth International |
| Douglas Lake (DGF) | Douglas Lake | BC | Trona to Douglas Lake |
| Douglas Municipal (DGL) | Douglas | AZ | Trona to Douglas Municipal |
| Durango (DGO) | Durango | Dur | Trona to Durango |
| Converse County (DGW) | Douglas | WY | Trona to Converse County |
| Dothan Regional (DHN) | Dothan | AL | Trona to Dothan Regional |
| Dalhart Municipal (DHT) | Dalhart | TX | Trona to Dalhart Municipal |
| Dickinson Theodore Roosevelt Regional (DIK) | Dickinson | ND | Trona to Dickinson Theodore Roosevelt Regional |
| Chautauqua County/Dunkirk (DKK) | Dunkirk | NY | Trona to Chautauqua County/Dunkirk |
| Dillingham (DLG) | Dillingham | AK | Trona to Dillingham |
| Duluth International (DLH) | Duluth | MN | Trona to Duluth International |
| Dillon (DLN) | Dillon | MT | Trona to Dillon |
| The Dalles Municipal/Columbia Gorge Regional (DLS) | The Dalles | OR | Trona to The Dalles Municipal/Columbia Gorge Regional |
| Deming Municipal (DMN) | Deming | NM | Trona to Deming Municipal |
| Sedalia Regional (DMO) | Sedalia | MO | Trona to Sedalia Regional |
| Dalton Municipal (DNN) | Dalton | GA | Trona to Dalton Municipal |
| Denison Municipal (DNS) | Denison | IA | Trona to Denison Municipal |
| Vermilion Regional (DNV) | Danville | IL | Trona to Vermilion Regional |
| Dover AFB (DOV) | Dover | DE | Trona to Dover AFB |
| Dupage (DPA) | Chicago | IL | Trona to Dupage |
| Beauregard Regional (DRI) | De Ridder | LA | Trona to Beauregard Regional |
| Durango/La Plata County (DRO) | Durango | CO | Trona to Durango/La Plata County |
| Del Rio International (DRT) | Del Rio | TX | Trona to Del Rio International |
| Destin Executive (DSI) | Destin | FL | Trona to Destin Executive |
| Des Moines International (DSM) | Des Moines | IA | Trona to Des Moines International |
| Delta Municipal (DTA) | Delta | UT | Trona to Delta Municipal |
| Detroit Lakes-Wething Field (DTL) | Detroit Lakes | MN | Trona to Detroit Lakes-Wething Field |
| Shreveport Downtown (DTN) | Shreveport | LA | Trona to Shreveport Downtown |
| Detroit Metro Wayne County (DTW) | Detroit | MI | Trona to Detroit Metro Wayne County |
| Durant Regional - Eaker Field (DUA) | Durant | OK | Trona to Durant Regional - Eaker Field |
| Halliburton Field (DUC) | Duncan | OK | Trona to Halliburton Field |
| Bisbee Douglas International (DUG) | Douglas/Bisbee | AZ | Trona to Bisbee Douglas International |
| Dubois Regional (DUJ) | DuBois | PA | Trona to Dubois Regional |
| Devils Lake Regional (DVL) | Devils Lake | ND | Trona to Devils Lake Regional |
| Davenport Municipal (DVN) | Davenport | IA | Trona to Davenport Municipal |
| Phoenix Deer Valley (DVT) | Phoenix | AZ | Trona to Phoenix Deer Valley |
| David Wayne Hooks Memorial (DWH) | Houston | TX | Trona to David Wayne Hooks Memorial |
| Olds-Didsbury (EA3) | Olds-Didsbury | AB | Trona to Olds-Didsbury |
| Cardston (EA6) | Cardston | AB | Trona to Cardston |
| Phifer Airfield (EAN) | Wheatland | WY | Trona to Phifer Airfield |
| Kearney Regional (EAR) | Kearney | NE | Trona to Kearney Regional |
| Pangborn Memorial (EAT) | Wenatchee | WA | Trona to Pangborn Memorial |
| Chippewa Valley Regional (EAU) | Eau Claire | WI | Trona to Chippewa Valley Regional |
| Elizabeth City Regional & Coast Guard Station (ECG) | Elizabeth City | NC | Trona to Elizabeth City Regional & Coast Guard Station |
| Northwest Florida Beaches International (ECP) | Panama City | FL | Trona to Northwest Florida Beaches International |
| Mondell Field (ECS) | Newcastle | WY | Trona to Mondell Field |
| Oyen Municipal (ED3) | Oyen | AB | Trona to Oyen Municipal |
| Taber (ED5) | Taber | AB | Trona to Taber |
| Northeastern Regional (EDE) | Edenton | NC | Trona to Northeastern Regional |
| El Dorado/Captain Jack Thomas Memorial (EDK) | El Dorado | KS | Trona to El Dorado/Captain Jack Thomas Memorial |
| Needles (EED) | Needles | CA | Trona to Needles |
| Dilliant-Hopkins (EEN) | Keene | NH | Trona to Dilliant-Hopkins |
| Bow Island (EF3) | Bow Island | AB | Trona to Bow Island |
| Airdrie (EF4) | Airdrie | AB | Trona to Airdrie |
| Ellington (EFD) | Houston | TX | Trona to Ellington |
| Northeast Kingdom International (EFK) | Newport | VT | Trona to Northeast Kingdom International |
| Drumheller Municipal (EG4) | Drumheller | AB | Trona to Drumheller Municipal |
| Eagle County Regional (EGE) | Eagle | CO | Trona to Eagle County Regional |
| Maverick County Memorial International (EGP) | Eagle Pass | TX | Trona to Maverick County Memorial International |
| Eagle River Union (EGV) | Eagle River | WI | Trona to Eagle River Union |
| South Calgary (EH4) | De Winton | AB | Trona to South Calgary |
| Provost (EH6) | Provost | AB | Trona to Provost |
| Claresholm Industrial (EJ4) | Claresholm | AB | Trona to Claresholm Industrial |
| Eureka/Murray Field (EKA) | Eureka | CA | Trona to Eureka/Murray Field |
| Elkhart Municipal (EKI) | Elkhart | IN | Trona to Elkhart Municipal |
| Elko Regional/Harris Field (EKO) | Elko | NV | Trona to Elko Regional/Harris Field |
| Addington Field (EKX) | Elizabethtown | KY | Trona to Addington Field |
| Hanna (EL4) | Hanna | AB | Trona to Hanna |
| Eagle Lake (ELA) | Eagle Lake | TX | Trona to Eagle Lake |
| South Arkansas Regional at Goodwin Field (ELD) | El Dorado | AR | Trona to South Arkansas Regional at Goodwin Field |
| North Eleuthera (ELH) | Eleuthera Island | | Trona to North Eleuthera |
| Elk City Regional Business (ELK) | Elk City | OK | Trona to Elk City Regional Business |
| Elmira/Corning Regional (ELM) | Elmira | NY | Trona to Elmira/Corning Regional |
| Bowers Field (ELN) | Ellensburg | WA | Trona to Bowers Field |
| El Paso International (ELP) | El Paso | TX | Trona to El Paso International |
| Ely/Yelland Field (ELY) | Ely | NV | Trona to Ely/Yelland Field |
| Wellsville Municipal/Tarantine Field (ELZ) | Wellsville | NY | Trona to Wellsville Municipal/Tarantine Field |
| Innisfail (EM4) | Innisfail | AB | Trona to Innisfail |
| Kemmerer Municipal (EMM) | Kemmerer | WY | Trona to Kemmerer Municipal |
| Emporia Municipal (EMP) | Emporia | KS | Trona to Emporia Municipal |
| San Gabriel Valley (EMT) | El Monte | CA | Trona to San Gabriel Valley |
| Three Hills (EN3) | Three Hills | AB | Trona to Three Hills |
| High River (EN4) | High River | AB | Trona to High River |
| Kenai Municipal (ENA) | Kenai | AK | Trona to Kenai Municipal |
| Centralia Municipal (ENL) | Centralia | IL | Trona to Centralia Municipal |
| Wendover (ENV) | Wendover | UT | Trona to Wendover |
| Kenosha Regional (ENW) | Kenosha | WI | Trona to Kenosha Regional |
| Keokuk Municipal (EOK) | Keokuk | IA | Trona to Keokuk Municipal |
| Neosho Hugh Robinson (EOS) | Neosho | MO | Trona to Neosho Hugh Robinson |
| Ephrata Municipal (EPH) | Ephrata | WA | Trona to Ephrata Municipal |
| Erie International/Tom Ridge Field (ERI) | Erie | PA | Trona to Erie International/Tom Ridge Field |
| Kerrville Municipal/Louis Schreiner Field (ERV) | Kerrville | TX | Trona to Kerrville Municipal/Louis Schreiner Field |
| Delta County (ESC) | Escanaba | MI | Trona to Delta County |
| Ensenada/Gen Alberto Salinas (ESE) | Ensenada | Baj | Trona to Ensenada/Gen Alberto Salinas |
| Esler Regional (ESF) | Alexandria | LA | Trona to Esler Regional |
| Easton/Newnam Field (ESN) | Easton | MD | Trona to Easton/Newnam Field |
| Ohkay Owingeh (ESO) | Espanola | NM | Trona to Ohkay Owingeh |
| Estherville Municipal (EST) | Estherville | IA | Trona to Estherville Municipal |
| West Bend Municipal (ETB) | West Bend | WI | Trona to West Bend Municipal |
| Eastland Municipal (ETN) | Eastland | TX | Trona to Eastland Municipal |
| Enterprise Municipal (ETS) | Enterprise | AL | Trona to Enterprise Municipal |
| Eureka (EUE) | Eureka | NV | Trona to Eureka |
| Weedon Field (EUF) | Eufaula | AL | Trona to Weedon Field |
| Mahlon Sweet Field (EUG) | Eugene | OR | Trona to Mahlon Sweet Field |
| Eveleth-Virginia Municipal (EVM) | Eveleth | MN | Trona to Eveleth-Virginia Municipal |
| Evansville Regional (EVV) | Evansville | IN | Trona to Evansville Regional |
| Evanston-Uinta County Burns Field (EVW) | Evanston | WY | Trona to Evanston-Uinta County Burns Field |
| New Bedford Regional (EWB) | New Bedford | MA | Trona to New Bedford Regional |
| Newton City County (EWK) | Newton | KS | Trona to Newton City County |
| Coastal Carolina Regional (EWN) | New Bern | NC | Trona to Coastal Carolina Regional |
| Newark Liberty International (EWR) | Newark | NJ | Trona to Newark Liberty International |
| Fort Macleod (EY3) | Fort Macleod | AB | Trona to Fort Macleod |
| Yerington Municipal (EYR) | Yerington | NV | Trona to Yerington Municipal |
| Fairbanks International (FAI) | Fairbanks | AK | Trona to Fairbanks International |
| Farmington Regional (FAM) | Farmington | MO | Trona to Farmington Regional |
| Hector International Fargo (FAR) | Fargo | ND | Trona to Hector International Fargo |
| Fresno Yosemite International (FAT) | Fresno | CA | Trona to Fresno Yosemite International |
| Fayetteville Regional/Grannis Field (FAY) | Fayetteville | NC | Trona to Fayetteville Regional/Grannis Field |
| Faribault Municipal (FBL) | Faribault | MN | Trona to Faribault Municipal |
| Fort Bridger Airport (FBR) | Fort Bridger | WY | Trona to Fort Bridger Airport |
| Fairbury Municipal (FBY) | Fairbury | NE | Trona to Fairbury Municipal |
| Glacier Park International (FCA) | Kalispell | MT | Trona to Glacier Park International |
| Fresno Chandler Executive (FCH) | Fresno | CA | Trona to Fresno Chandler Executive |
| Flying Cloud (FCM) | Minneapolis | MN | Trona to Flying Cloud |
| Foremost (FD4) | Foremost | AB | Trona to Foremost |
| Frederick Regional (FDR) | Frederick | OK | Trona to Frederick Regional |
| Findlay (FDY) | Findlay | OH | Trona to Findlay |
| Albertus (FEP) | Freeport | IL | Trona to Albertus |
| Fremont Municipal (FET) | Fremont | NE | Trona to Fremont Municipal |
| Fairfield Municipal (FFL) | Fairfield | IA | Trona to Fairfield Municipal |
| Fergus Falls Municipal-Einar Mickelson Field (FFM) | Fergus Falls | MN | Trona to Fergus Falls Municipal-Einar Mickelson Field |
| Capital City (FFT) | Frankfort | KY | Trona to Capital City |
| Sierra Vista Municipal/Libby AAF (FHU) | Fort Huachuca | AZ | Trona to Sierra Vista Municipal/Libby AAF |
| Fillmore Municipal (FIL) | Fillmore | UT | Trona to Fillmore Municipal |
| Venango Regional (FKL) | Franklin | PA | Trona to Venango Regional |
| Empress (FL2) | Empress | AB | Trona to Empress |
| Fond Du Lac County (FLD) | Fond Du Lac | WI | Trona to Fond Du Lac County |
| Flagstaff Pulliam (FLG) | Flagstaff | AZ | Trona to Flagstaff Pulliam |
| Fort Lauderdale Hollywood International (FLL) | Fort Lauderdale | FL | Trona to Fort Lauderdale Hollywood International |
| Florence Regional (FLO) | Florence | SC | Trona to Florence Regional |
| Marion County Regional (FLP) | Flippin | AR | Trona to Marion County Regional |
| Sherman Army Airfield (FLV) | Fort Leavenworth | KS | Trona to Sherman Army Airfield |
| Fallon Municipal (FLX) | Fallon | NV | Trona to Fallon Municipal |
| Four Corners Regional (FMN) | Farmington | NM | Trona to Four Corners Regional |
| Fort Madison Municipal (FMS) | Fort Madison | IA | Trona to Fort Madison Municipal |
| Page Field (FMY) | Fort Myers | FL | Trona to Page Field |
| Northern Colorado Regional (FNL) | Ft Collins/Loveland | CO | Trona to Northern Colorado Regional |
| Bishop International (FNT) | Flint | MI | Trona to Bishop International |
| Fort Dodge Regional (FOD) | Fort Dodge | IA | Trona to Fort Dodge Regional |
| Topeka Regional (FOE) | Topeka | KS | Trona to Topeka Regional |
| Francis S Gabreski (FOK) | Westhampton Beach | NY | Trona to Francis S Gabreski |
| Grand Bahama International (FPO) | Freeport | | Trona to Grand Bahama International |
| Treasure Coast International (FPR) | Fort Pierce | FL | Trona to Treasure Coast International |
| Perry-Foley (FPY) | Perry | FL | Trona to Perry-Foley |
| Friday Harbor (FRD) | Friday Harbor | WA | Trona to Friday Harbor |
| Republic Long Island (FRG) | Farmingdale | NY | Trona to Republic Long Island |
| French Lick Municipal (FRH) | French Lick | IN | Trona to French Lick Municipal |
| Fairmont Municipal (FRM) | Fairmont | MN | Trona to Fairmont Municipal |
| Loon River (FS6) | Loon River | AB | Trona to Loon River |
| Sioux Falls Regional, Joe Foss Field (FSD) | Sioux Falls | SD | Trona to Sioux Falls Regional, Joe Foss Field |
| Fort Scott Municipal (FSK) | Fort Scott | KS | Trona to Fort Scott Municipal |
| Fort Smith Regional (FSM) | Fort Smith | AR | Trona to Fort Smith Regional |
| Fort Stockton-Pecos County (FST) | Fort Stockton | TX | Trona to Fort Stockton-Pecos County |
| Fort Sumner Municipal (FSU) | Fort Sumner | NM | Trona to Fort Sumner Municipal |
| Fort Worth Meacham International (FTW) | Fort Worth | TX | Trona to Fort Worth Meacham International |
| Fulton County/Brown Field (FTY) | Atlanta | GA | Trona to Fulton County/Brown Field |
| Fullerton Municipal (FUL) | Fullerton | CA | Trona to Fullerton Municipal |
| Fort Wayne International (FWA) | Fort Wayne | IN | Trona to Fort Wayne International |
| Branson West Municipal - Emerson Field (FWB) | Branson West | MO | Trona to Branson West Municipal - Emerson Field |
| Okotoks Air Ranch (FX2) | Calgary | AB | Trona to Okotoks Air Ranch |
| Manning Municipal (FX4) | Manning | AB | Trona to Manning Municipal |
| Fort Lauderdale Executive (FXE) | Fort Lauderdale | FL | Trona to Fort Lauderdale Executive |
| Forest City Municipal (FXY) | Forest City | IA | Trona to Forest City Municipal |
| Fayetteville Municipal (FYM) | Fayetteville | TN | Trona to Fayetteville Municipal |
| Drake Field (FYV) | Fayetteville | AR | Trona to Drake Field |
| Northeast Alabama Regional (GAD) | Gadsden | AL | Trona to Northeast Alabama Regional |
| Gage (GAG) | Gage | OK | Trona to Gage |
| Edward G Pitka Sr (GAL) | Galena | AK | Trona to Edward G Pitka Sr |
| Great Bend Municipal (GBD) | Great Bend | KS | Trona to Great Bend Municipal |
| Galesburg Municipal (GBG) | Galesburg | IL | Trona to Galesburg Municipal |
| Gillette-Campbell County (GCC) | Gillette | WY | Trona to Gillette-Campbell County |
| Grand Coulee Dam (GCD) | Electric City | WA | Trona to Grand Coulee Dam |
| Garden City Regional (GCK) | Garden City | KS | Trona to Garden City Regional |
| Grand Cayman/Owen Roberts Intl (GCM) | Grand Cayman | | Trona to Grand Cayman/Owen Roberts Intl |
| Grand Canyon National Park (GCN) | Grand Canyon | AZ | Trona to Grand Canyon National Park |
| Greeneville-Greene County Municipal (GCY) | Greeneville | TN | Trona to Greeneville-Greene County Municipal |
| Donaldson Field (GDC) | Greenville | SC | Trona to Donaldson Field |
| Guadalajara/Don Miguel Hidalgo y Costilla (GDL) | Guadalajara | Jal | Trona to Guadalajara/Don Miguel Hidalgo y Costilla |
| Grand Turk (Jags Mccartney) Intl (GDT) | Grand Turk I | | Trona to Grand Turk (Jags Mccartney) Intl |
| Dawson Community (GDV) | Glendive | MT | Trona to Dawson Community |
| Gladwin Zettel Memorial (GDW) | Gladwin | MI | Trona to Gladwin Zettel Memorial |
| Delaware Coastal (GED) | Georgetown | DE | Trona to Delaware Coastal |
| Spokane International (GEG) | Spokane | WA | Trona to Spokane International |
| South Big Horn County (GEY) | Greybull | WY | Trona to South Big Horn County |
| Grand Forks International (GFK) | Grand Forks | ND | Trona to Grand Forks International |
| Georgetown County (GGE) | Georgetown | SC | Trona to Georgetown County |
| East Texas Regional (GGG) | Longview | TX | Trona to East Texas Regional |
| Exuma International (GGT) | Exuma Islands | | Trona to Exuma International |
| Wokal Field/Glasgow International (GGW) | Glasgow | MT | Trona to Wokal Field/Glasgow International |
| Eleuthera Island/Governors Harbour Intl (GHB) | Eleuthera Island | | Trona to Eleuthera Island/Governors Harbour Intl |
| Centerville Municipal (GHM) | Centerville | TN | Trona to Centerville Municipal |
| Grand Junction Regional Walker Field (GJT) | Grand Junction | CO | Trona to Grand Junction Regional Walker Field |
| Gatlinburg-Pigeon Forge (GKT) | Sevierville | TN | Trona to Gatlinburg-Pigeon Forge |
| San Carlos Apache (GLB) | Globe | AZ | Trona to San Carlos Apache |
| Renner Field/Goodland Municipal (GLD) | Goodland | KS | Trona to Renner Field/Goodland Municipal |
| Gainesville Municipal (GLE) | Gainesville | TX | Trona to Gainesville Municipal |
| Greenville Mid-Delta (GLH) | Greenville | MS | Trona to Greenville Mid-Delta |
| Gaylord Regional (GLR) | Gaylord | MI | Trona to Gaylord Regional |
| Scholes International at Galveston (GLS) | Galveston | TX | Trona to Scholes International at Galveston |
| Glasgow Municipal (GLW) | Glasgow | KY | Trona to Glasgow Municipal |
| Greenville Downtown (GMU) | Greenville | SC | Trona to Greenville Downtown |
| Gansner Field (GNF) | Quincy | CA | Trona to Gansner Field |
| Gooding Municipal (GNG) | Gooding | ID | Trona to Gooding Municipal |
| Grants-Milan Municipal (GNT) | Grants | NM | Trona to Grants-Milan Municipal |
| Gainesville Regional (GNV) | Gainesville | FL | Trona to Gainesville Regional |
| Guthrie-Edmond Regional (GOK) | Guthrie | OK | Trona to Guthrie-Edmond Regional |
| Gold Beach Municipal (GOL) | Gold Beach | OR | Trona to Gold Beach Municipal |
| Gulfport-Biloxi International (GPT) | Gulfport | MS | Trona to Gulfport-Biloxi International |
| Grand Rapids/Itasca County-Gordon Newstrom Field (GPZ) | Grand Rapids | MN | Trona to Grand Rapids/Itasca County-Gordon Newstrom Field |
| Austin Straubel International (GRB) | Green Bay | WI | Trona to Austin Straubel International |
| Greenwood County (GRD) | Greenwood | SC | Trona to Greenwood County |
| Greenville (GRE) | Greenville | IL | Trona to Greenville |
| Central Nebraska Regional (GRI) | Grand Island | NE | Trona to Central Nebraska Regional |
| Killeen/Fort Hood Regional/Robert Gray AAF (GRK) | Killeen | TX | Trona to Killeen/Fort Hood Regional/Robert Gray AAF |
| Grand Marais/Cook County (GRM) | Grand Marais | MN | Trona to Grand Marais/Cook County |
| Gordon Municipal (GRN) | Gordon | NE | Trona to Gordon Municipal |
| Gerald R Ford International (GRR) | Grand Rapids | MI | Trona to Gerald R Ford International |
| Goshen Municipal (GSH) | Goshen | IN | Trona to Goshen Municipal |
| Piedmont Triad International (GSO) | Greensboro | NC | Trona to Piedmont Triad International |
| Greenville Spartanburg International (GSP) | Greer | SC | Trona to Greenville Spartanburg International |
| Gustavus (GST) | Gustavus | AK | Trona to Gustavus |
| Great Falls International (GTF) | Great Falls | MT | Trona to Great Falls International |
| Grants Pass (GTP) | Grants Pass | OR | Trona to Grants Pass |
| Golden Triangle Regional (GTR) | Columbus | MS | Trona to Golden Triangle Regional |
| Gunnison/Crested Butte Regional (GUC) | Gunnison | CO | Trona to Gunnison/Crested Butte Regional |
| Jack Edwards National (GUF) | Gulf Shores | AL | Trona to Jack Edwards National |
| Gallup Municipal (GUP) | Gallup | NM | Trona to Gallup Municipal |
| Grissom Aeroplex/Arb (GUS) | Peru | IN | Trona to Grissom Aeroplex/Arb |
| Guymon Municipal (GUY) | Guymon | OK | Trona to Guymon Municipal |
| Lee Gilmer Memorial (GVL) | Gainesville | GA | Trona to Lee Gilmer Memorial |
| Majors (GVT) | Greenville | TX | Trona to Majors |
| Greenwood Leflore (GWO) | Greenwood | MS | Trona to Greenwood Leflore |
| Glenwood Springs Municipal (GWS) | Glenwood Springs | CO | Trona to Glenwood Springs Municipal |
| Greeley-Weld County (GXY) | Greeley | CO | Trona to Greeley-Weld County |
| Guaymas/Gen Jose Maria Yanez International (GYM) | Guaymas | Son | Trona to Guaymas/Gen Jose Maria Yanez International |
| Phoenix Goodyear (GYR) | Goodyear | AZ | Trona to Phoenix Goodyear |
| Gary/Chicago International (GYY) | GARY | IN | Trona to Gary/Chicago International |
| Marion County-Rankin Fite (HAB) | Hamilton | AL | Trona to Marion County-Rankin Fite |
| Half Moon Bay (HAF) | Half Moon Bay | CA | Trona to Half Moon Bay |
| Three Rivers Municipal Dr Haines (HAI) | Three Rivers | MI | Trona to Three Rivers Municipal Dr Haines |
| Butler County Regional-Hogan Field (HAO) | Hamilton | OH | Trona to Butler County Regional-Hogan Field |
| Hattiesburg Bobby L Chain Municipal (HBG) | Hattiesburg | MS | Trona to Hattiesburg Bobby L Chain Municipal |
| Holbrook Municipal (HBK) | Holbrook | AZ | Trona to Holbrook Municipal |
| Hobart Regional (HBR) | Hobart | OK | Trona to Hobart Regional |
| Big Spring Mc Mahon-Wrinkle (HCA) | Big Spring | TX | Trona to Big Spring Mc Mahon-Wrinkle |
| Columbia County (HCC) | Hudson | NY | Trona to Columbia County |
| Brewster Field (HDE) | Holdrege | NE | Trona to Brewster Field |
| Dillingham Airfield (HDH) | Mokuleia | HI | Trona to Dillingham Airfield |
| Hayden Yampa Valley Regional (HDN) | Hayden | CO | Trona to Hayden Yampa Valley Regional |
| Thompson-Robbins (HEE) | Helena/West Helena | AR | Trona to Thompson-Robbins |
| Manassas Regional/Harry P Davis Field (HEF) | Manassas | VA | Trona to Manassas Regional/Harry P Davis Field |
| Hermiston Municipal (HES) | Hermiston | OR | Trona to Hermiston Municipal |
| Natchez-Adams County (Hardy-Anders Field) (HEZ) | Natchez | MS | Trona to Natchez-Adams County (Hardy-Anders Field) |
| Richard A Henson Field/Hagerstown Regional (HGR) | Hagerstown | MD | Trona to Richard A Henson Field/Hagerstown Regional |
| Hawthorne Municipal/Jack Northrop Field (HHR) | Hawthorne | CA | Trona to Hawthorne Municipal/Jack Northrop Field |
| Range Regional (HIB) | Hibbing | MN | Trona to Range Regional |
| Lake Havasu City (HII) | Lake Havasu City | AZ | Trona to Lake Havasu City |
| Portland/Hillsboro (HIO) | Portland | OR | Trona to Portland/Hillsboro |
| Blytheville Municipal (HKA) | Blytheville | AR | Trona to Blytheville Municipal |
| Hawkins Field (HKS) | Jackson | MS | Trona to Hawkins Field |
| Hickory Regional (HKY) | Hickory | NC | Trona to Hickory Regional |
| Hill City Municipal (HLC) | Hill City | KS | Trona to Hill City Municipal |
| Wheeling Ohio County (HLG) | Wheeling | WV | Trona to Wheeling Ohio County |
| Hollister Municipal (HLI) | Hollister | CA | Trona to Hollister Municipal |
| Helena Regional (HLN) | Helena | MT | Trona to Helena Regional |
| Hermosillo/Gen Ignacio P Garcia (HMO) | Hermosillo | Son | Trona to Hermosillo/Gen Ignacio P Garcia |
| Hemet-Ryan (HMT) | Hemet | CA | Trona to Hemet-Ryan |
| Huntingburg (HNB) | Huntingburg | IN | Trona to Huntingburg |
| Honolulu International (HNL) | Honolulu | HI | Trona to Honolulu International |
| Haines (HNS) | Haines | AK | Trona to Haines |
| Hobbs/Lea County Regional (HOB) | Hobbs | NM | Trona to Hobbs/Lea County Regional |
| Homer (HOM) | Homer | AK | Trona to Homer |
| Huron Regional (HON) | Huron | SD | Trona to Huron Regional |
| Memorial Field (HOT) | Hot Springs | AR | Trona to Memorial Field |
| William P Hobby (HOU) | Houston | TX | Trona to William P Hobby |
| Westchester County (HPN) | White Plains | NY | Trona to Westchester County |
| Hampton Municipal (HPT) | Hampton | IA | Trona to Hampton Municipal |
| Baytown (HPY) | Houston | TX | Trona to Baytown |
| Bowerman (HQM) | Hoquiam | WA | Trona to Bowerman |
| Valley International (HRL) | Harlingen | TX | Trona to Valley International |
| Boone County Regional (HRO) | Harrison | AR | Trona to Boone County Regional |
| Harrisburg-Raleigh (HSB) | Harrisburg | IL | Trona to Harrisburg-Raleigh |
| Henderson Executive (HSH) | Las Vegas | NV | Trona to Henderson Executive |
| Hastings Municipal (HSI) | Hastings | NE | Trona to Hastings Municipal |
| Ingalls Field (HSP) | Hot Springs | VA | Trona to Ingalls Field |
| Huntsville International/Carl T Jones Field (HSV) | Huntsville | AL | Trona to Huntsville International/Carl T Jones Field |
| Hawthorne Industrial (HTH) | Hawthorne | NV | Trona to Hawthorne Industrial |
| Roscommon County - Blodgett Memorial (HTL) | Houghton Lake | MI | Trona to Roscommon County - Blodgett Memorial |
| Tri-State Milton J Ferguson Field (HTS) | Huntington | WV | Trona to Tri-State Milton J Ferguson Field |
| Huntsville Municipal (HTV) | Huntsville | TX | Trona to Huntsville Municipal |
| Terre Haute Regional (HUF) | Terre Haute | IN | Trona to Terre Haute Regional |
| Stan Stamper Municipal (HUJ) | Hugo | OK | Trona to Stan Stamper Municipal |
| Houma-Terrebonne (HUM) | Houma | LA | Trona to Houma-Terrebonne |
| Hutchinson Regional (HUT) | Hutchinson | KS | Trona to Hutchinson Regional |
| Bahias De Huatulco (HUX) | Bahias del Huatulco | Oax | Trona to Bahias De Huatulco |
| Hanksville (HVE) | Hanksville | UT | Trona to Hanksville |
| Tweed/New Haven (HVN) | New Haven | CT | Trona to Tweed/New Haven |
| Havre City-County (HVR) | Havre | MT | Trona to Havre City-County |
| Hayward Executive (HWD) | Hayward | CA | Trona to Hayward Executive |
| Barnstable Municipal/Boardman-Polando Field (HYA) | Hyannis | MA | Trona to Barnstable Municipal/Boardman-Polando Field |
| San Marcos Regional (HYI) | San Marcos | TX | Trona to San Marcos Regional |
| Sawyer County (HYR) | Hayward | WI | Trona to Sawyer County |
| Hays Regional (HYS) | Hays | KS | Trona to Hays Regional |
| Washington Dulles International (IAD) | Washington | VA | Trona to Washington Dulles International |
| Niagara Falls International (IAG) | Niagara Falls | NY | Trona to Niagara Falls International |
| George Bush Intercontinental Houston (IAH) | Houston | TX | Trona to George Bush Intercontinental Houston |
| Schenck Field (ICL) | Clarinda | IA | Trona to Schenck Field |
| Cascade (ICS) | Cascade | ID | Trona to Cascade |
| Wichita Eisenhower National (ICT) | Wichita | KS | Trona to Wichita Eisenhower National |
| Idaho Falls Regional (IDA) | Idaho Falls | ID | Trona to Idaho Falls Regional |
| Indiana County/Jimmy Stewart Field (IDI) | Indiana | PA | Trona to Indiana County/Jimmy Stewart Field |
| Independence Municipal (IDP) | Independence | KS | Trona to Independence Municipal |
| Iowa Falls Municipal (IFA) | Iowa Falls | IA | Trona to Iowa Falls Municipal |
| Laughlin/Bullhead International (IFP) | Bullhead City | AZ | Trona to Laughlin/Bullhead International |
| Great Inagua Island/Matthew Town (IGA) | Great Inagua Island | | Trona to Great Inagua Island/Matthew Town |
| Kingman (IGM) | Kingman | AZ | Trona to Kingman |
| Jacksonville Municipal (IJX) | Jacksonville | IL | Trona to Jacksonville Municipal |
| Wilkes County (IKB) | N Wilkesboro | NC | Trona to Wilkes County |
| Greater Kankakee (IKK) | Kankakee | IL | Trona to Greater Kankakee |
| Skylark Field Killeen (ILE) | Killeen | TX | Trona to Skylark Field Killeen |
| Wilmington/New Castle (ILG) | Wilmington | DE | Trona to Wilmington/New Castle |
| Willmar Municipal/John L Rice Field (ILL) | Willmar | MN | Trona to Willmar Municipal/John L Rice Field |
| Wilmington International (ILM) | Wilmington | NC | Trona to Wilmington International |
| Wilmington Airpark (ILN) | Wilmington | OH | Trona to Wilmington Airpark |
| Imperial Municipal (IML) | Imperial | NE |
