| - | - | Albert | Philipsburg | |
| AEL | KAEL | Albert Lea Airport | Albert Lea | |
| FEP | KFEP | Albertus Airport | Freeport | |
| - | - | Albia Municipal | Albia | |
| - | - | Albion Municipal | Albion | |
| - | KBVN | Albion Municipal | Albion | |
| - | - | Alderman | St Clairsville | |
| AED | - | Aleneva Airport | Aleneva | |
| - | - | Alexander Municipal | Belen | |
| - | - | Alexandria | Alexandria | |
| - | - | Alexandria | Pittstown | |
| AXB | - | Alexandria Bay Airport | Alexandria Bay | |
| AXG | KAXA | Algona Airport | Algona | |
| - | - | Alkali Lake State | Alkali Lake | |
| BIG | - | Allen Army Airfield | Delta Junction | |
| AOH | KAOH | Allen County Airport | Lima | |
| - | - | Allen Parish | Oakdale | |
| - | - | Allendale Co | Allendale | |
| - | - | Allentown-Queen City Municipal | Allentown | |
| - | - | Allied | Tulsa | |
| - | - | Alma Municipal | Alma | |
| - | - | Almena | Paw Paw | |
| - | - | Almyra Municipal | Almyra | |
| - | - | Alpine | Alpine | |
| - | PALP | Alpine Airstrip | Nuiqsut | |
| - | - | Alpine Co | Markleeville | |
| - | - | Alta | Dinuba | |
| - | KAAT | Alturas Municipal | Alturas | |
| LTS | KLTS | Altus Air Force Base | Altus | |
| AXS | KAXS | Altus Municipal Airport | Altus | |
| - | - | Alva Regional | Alva | |
| - | - | Alvin Airpark | Alvin | |
| AQY | - | Alyeska Airport | Alyeska | |
| - | - | Amana | Amana | |
| AHT | - | Amchitka Airport | Amchitka | |
| AHC | KAHC | Amedee Army Air Field | Herlong | |
| - | - | American Falls | American Falls | |
| AHH | KAHH | Amery Municipal Airport | Amery | |
| - | - | Ames | Trenton | |
| AMW | KAMW | Ames Airport | Ames | |
| OTS | - | Anacortes Airport | Anacortes | |
| - | - | Anadarko Municipal | Anadarko | |
| - | - | Andalusia-Opp Municipal | Andalusia/Opp | |
| - | - | Anderson | Brewster | |
| AID | KAID | Anderson Municipal Airport | Anderson | |
| AAP | - | Andrau Airpark | Houston | |
| ADR | KPHH | Andrews Airport | Andrews | |
| - | - | Andrews Co | Andrews | |
| NSF | - | Andrews Navy Air Field | Camp Springs | |
| - | - | Andrews University | Berrien Springs | |