| Code | Description |
|---|
| ABE | Allentown/Bethlehem/Easton, PA: Lehigh Valley International |
| ABI | Abilene, TX: Abilene Regional |
| ABQ | Albuquerque, NM: Albuquerque International Sunport |
| ABR | Aberdeen, SD: Aberdeen Regional |
| ABY | Albany, GA: Southwest Georgia Regional |
| ACK | Nantucket, MA: Nantucket Memorial |
| ACT | Waco, TX: Waco Regional |
| ACV | Arcata/Eureka, CA: California Redwood Coast Humboldt County |
| ACY | Atlantic City, NJ: Atlantic City International |
| ADK | Adak Island, AK: Adak |
| ADQ | Kodiak, AK: Kodiak Airport |
| AEX | Alexandria, LA: Alexandria International |
| AGS | Augusta, GA: Augusta Regional at Bush Field |
| AKN | King Salmon, AK: King Salmon Airport |
| ALB | Albany, NY: Albany International |
| ALO | Waterloo, IA: Waterloo Regional |
| ALS | Alamosa, CO: San Luis Valley Regional/Bergman Field |
| ALW | Walla Walla, WA: Walla Walla Regional |
| AMA | Amarillo, TX: Rick Husband Amarillo International |
| ANC | Anchorage, AK: Ted Stevens Anchorage International |
| ANI | Aniak, AK: Aniak Airport |
| APF | Naples, FL: Naples Municipal |
| APN | Alpena, MI: Alpena County Regional |
| ART | Watertown, NY: Watertown International |
| ASE | Aspen, CO: Aspen Pitkin County Sardy Field |
| ATL | Atlanta, GA: Hartsfield-Jackson Atlanta International |
| ATW | Appleton, WI: Appleton International |
| ATY | Watertown, SD: Watertown Regional |
| AUS | Austin, TX: Austin - Bergstrom International |
| AVL | Asheville, NC: Asheville Regional |
| AVP | Scranton/Wilkes-Barre, PA: Wilkes Barre Scranton International |
| AZA | Phoenix, AZ: Phoenix - Mesa Gateway |
| AZO | Kalamazoo, MI: Kalamazoo/Battle Creek International |
| BDL | Hartford, CT: Bradley International |
| BET | Bethel, AK: Bethel Airport |
| BFF | Scottsbluff, NE: Western Neb. Regional/William B. Heilig Field |
| BFI | Seattle, WA: Boeing Field/King County International |
| BFL | Bakersfield, CA: Meadows Field |
| BFM | Mobile, AL: Mobile International |
| BGM | Binghamton, NY: Greater Binghamton/Edwin A. Link Field |
| BGR | Bangor, ME: Bangor International |
| BHM | Birmingham, AL: Birmingham-Shuttlesworth International |
| BIH | Bishop, CA: Bishop Airport |
| BIL | Billings, MT: Billings Logan International |
| BIS | Bismarck/Mandan, ND: Bismarck Municipal |
| BJI | Bemidji, MN: Bemidji Regional |
| BKG | Branson, MO: Branson Airport |
| BLI | Bellingham, WA: Bellingham International |
| BLV | Belleville, IL: Scott AFB MidAmerica St Louis |
| BMI | Bloomington/Normal, IL: Central Il Regional Airport at Bloomington |
| BNA | Nashville, TN: Nashville International |
| BOI | Boise, ID: Boise Air Terminal |
| BOS | Boston, MA: Logan International |
| BPT | Beaumont/Port Arthur, TX: Jack Brooks Regional |
| BQK | Brunswick, GA: Brunswick Golden Isles |
| BQN | Aguadilla, PR: Rafael Hernandez |
| BRD | Brainerd, MN: Brainerd Lakes Regional |
| BRO | Brownsville, TX: Brownsville South Padre Island International |
| BRW | Barrow, AK: Wiley Post/Will Rogers Memorial |
| BTM | Butte, MT: Bert Mooney |
| BTR | Baton Rouge, LA: Baton Rouge Metropolitan/Ryan Field |
| BTV | Burlington, VT: Burlington International |
| BUF | Buffalo, NY: Buffalo Niagara International |
| BUR | Burbank, CA: Bob Hope |
| BWI | Baltimore, MD: Baltimore/Washington International Thurgood Marshall |
| BZN | Bozeman, MT: Bozeman Yellowstone International |
| CAE | Columbia, SC: Columbia Metropolitan |
| CAK | Akron, OH: Akron-Canton Regional |
| CCR | Concord, CA: Buchanan Field |
| CDB | Cold Bay, AK: Cold Bay Airport |
| CDC | Cedar City, UT: Cedar City Regional |
| CDV | Cordova, AK: Merle K Mudhole Smith |
| CEC | Crescent City, CA: Jack McNamara Field |
| CGI | Cape Girardeau, MO: Cape Girardeau Regional |
| CHA | Chattanooga, TN: Lovell Field |
| CHO | Charlottesville, VA: Charlottesville Albemarle |
| CHS | Charleston, SC: Charleston AFB/International |
| CIC | Chico, CA: Chico Regional |
| CID | Cedar Rapids/Iowa City, IA: The Eastern Iowa |
| CIU | Sault Ste. Marie, MI: Chippewa County International |
| CKB | Clarksburg/Fairmont, WV: North Central West Virginia |
| CLD | Carlsbad, CA: McClellan-Palomar |
| CLE | Cleveland, OH: Cleveland-Hopkins International |
| CLL | College Station/Bryan, TX: Easterwood Field |
| CLT | Charlotte, NC: Charlotte Douglas International |
| CMH | Columbus, OH: John Glenn Columbus International |
| CMI | Champaign/Urbana, IL: University of Illinois/Willard |
| CMX | Hancock/Houghton, MI: Houghton County Memorial |
| CNY | Moab, UT: Canyonlands Regional |
| COD | Cody, WY: Yellowstone Regional |
| COS | Colorado Springs, CO: City of Colorado Springs Municipal |
| COU | Columbia, MO: Columbia Regional |
| CPR | Casper, WY: Casper/Natrona County International |
| CRP | Corpus Christi, TX: Corpus Christi International |
| CRW | Charleston/Dunbar, WV: West Virginia International Yeager |
| CSG | Columbus, GA: Columbus Airport |
| CVG | Cincinnati, OH: Cincinnati/Northern Kentucky International |
| CWA | Mosinee, WI: Central Wisconsin |
| CYS | Cheyenne, WY: Cheyenne Regional/Jerry Olson Field |
| DAB | Daytona Beach, FL: Daytona Beach International |
