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