| AAC | American Aerospace Controls | |
| AATC | American Aerospace Technical Castings | |
| AAWSAP | Advanced Aerospace Weapons Systems Application Program | |
| ACA | Aerospace Consultancy Associates | |
| ACPC | Aerospace Collaboration and Partnership Center | |
| ADC | Aerospace Defense Command | |
| ADFE | Aerospace Data Facility-East | |
| ADIC | Aerospace Defense Intelligence Center | |
| ADSE | Aerospace Defence and Security Expo | |
| ADSE | Aerospace Defence Security Expo | |
| AESU | Aerospace Environment Support Unit | |
| AFRSAF | Asia-Pacific Regional Space Agency Forum | |
| AGES | Aerospace Ground Equipment Schedule | |
| AGHBK | AGARD Handbook | |
| AIAO | Amphenol Industrial Aerospace Operations | |
| AIC | Aerospace Innovation Centre | |
| AIO | Aerospace Industries Organization | |
| AISI | Aerospace Industry Support Initiative | |
| ALAI | Air Launch Aerospace Indonesia | |
| ALTO | Air Launch To Orbit | |
| AMARG | Aerospace Maintenance and Regeneration Group | |
| AMDO | Aerospace Maintenance Duty Officer | |
| AMOOS | Autonomous Mission for On Orbit Servicing | |
| AMOOS | Advanced Maneuvering Orbit to Orbit Shuttle | |
| AMS | Aerospace Material Specifications | |
