| Abbreviation | Definition |
|---|---|
| AASHTO | American Association of State Highway and Transportation Officials |
| AASHTO | American Association of State Highway Transportation Officials |
| AASR | Aging Aircraft Safety Rule |
| AASR | Aging Airplane Safety Rule |
| AASTMT | Arab Academy for Science and Technology & Maritime Transport |
| AAT | Advanced Automotive Technologies |
| AAT | Alamo Alternative Transportation |
| AATA | Ann Arbor Transportation Authority |
| AATA | Arbor Area Transportation Authority |
| AATT | Addison Airport Toll Tunnel |
| AATT | Advanced Air Transport Technology |
| AATT | Airports Authority of Trinidad and Tobago |
| AAV | All Activity Vehicle |
| AAV | Amphibious Assault Vehicles |
| AAV | Anti Air Vehicle |
| AAV | Assault Amphibian Vehicle |
| AAVP | Advanced Air Vehicle Program |
| AAVP | Advanced Air Vehicles Program |
| AAWDT | Average Annual WeekDay Traffic |
| AAWG | Aviation Access Working Group (Australian) |