| ABL | PAFM | Ambler Airport | Ambler | |
| AOS | - | Amook Bay Seaplane Base | Amook | |
| AKP | PAKP | Anaktuvuk Airport | Anaktuvuk | |
| AND | KAND | Anderson Airport | Anderson | |
| ADW | KADW | Andrews Air Force Base | Camp Springs | |
| AXX | KAXX | Angel Fire Airport | Angel Fire | |
| AGN | - | Angoon Seaplane Base | Angoon | |
| ANI | PANI | Aniak Airport | Aniak | |
| AMK | - | Animas Air Park | Durango | |
| ARB | KARB | Ann Arbor Municipal Airport | Ann Arbor | |
| ANB | KANB | Anniston Regional Airport | Anniston | |
| - | KANE | Anoka Co-Blaine | Minneapolis | |
| ACB | KACB | Antrim County Airport | Bellaire | |
| ANV | PANV | Anvik Airport | Anvik | |
| ATW | KATW | Appleton International Airport | Appleton | |
| ACV | KACV | Arcata-Eureka Airport | Arcata | |
| ARC | PARC | Arctic Village Airport | Arctic Village | |
| ADM | KADM | Ardmore Municipal Airport | Ardmore | |
| - | KGKY | Arlington Municipal Airport | Arlington | |
| ASE | KASE | Aspen Airport | Aspen | |
| AST | KAST | Astoria Regional Airport | Astoria | |
| AHN | KAHN | Athens-Ben Epps Airport | Athens | |
| AKB | - | Atka Airport | Atka | |
| ACY | KACY | Atlantic City International Airport | Atlantic City | |
| ATT | - | Atmautluak Airport | Atmautluak | |
| ATK | PATQ | Atqasuk Airport | Atqasuk | |
| LEW | KLEW | Auburn Lewiston Municipal Airport | Auburn | |
| AUO | KAUO | Auburn University Regional Airport | Auburn | |
| AUG | KAUG | Augusta Airport | Augusta | |
| AGS | KAGS | Augusta Regional Airport | Augusta | |
| AUZ | KARR | Aurora Municipal Airport | Aurora | |
| - | KUAO | Aurora State | Aurora | |
| EDC | KEDC | Austin Executive Airport | Austin | |
| BGT | - | Bagdad Airport | Bagdad | |
| BKE | KBKE | Baker Airport | Baker | |
| BGR | KBGR | Bangor International Airport | Bangor | |
| BHB | KBHB | Bar Harbor Airport | Bar Harbor | |
| GCT | - | Bar Ten Ranch Airport | Grand Canyon | |
| - | KDLL | Baraboo-Wisconsin Dells Airport | Baraboo | |
| PAH | KPAH | Barkley Regional Airport | Paducah | |
| BAD | KBAD | Barksdale Air Force Base | Shreveport | |
| BTI | PABA | Barter Island Airport | Barter Island | |
| BVO | KBVO | Bartlesville Municipal Airport | Bartlesville | |
| BSZ | - | Bartletts Airport | Bartletts | |
| BIE | KBIE | Beatrice Municipal Airport | Beatrice | |
| BFT | KARW | Beaufort County Airport | Beaufort | |
| BMT | KBMT | Beaumont Municipal Airport | Beaumont | |
| WBQ | - | Beaver Airport | Beaver | |
| BLI | KBLI | Bellingham International Airport | Bellingham | |
| BJI | KBJI | Bemidji Airport | Bemidji | |