| Abbreviation | Definition |
|---|---|
| ASVC | Autonomous Surface Vehicle Competition |
| ASWT | Average Summer Weekday Traffic |
| ASYCUDA | Automated SYstem for CUstoms DAta |
| AT | Abnormal Tread wear |
| AT | Air Traffic |
| AT | Aircraft Tools |
| AT | Aircraft Transport |
| AT | Automatic Transmission |
| ATA | Actual Time of Arrival |
| ATA | Air Transport Association |
| ATA | Air Transport Association of America |
| ATA | Air Transportation Association |
| ATA | Airline Transport Association |
| ATA | Animal Transportation Association |
| ATA | Area Transportation Authority |
| ATA | Arrival Times Approximate |
| ATADS | FAA ( Federal Aviation Administration) Air Traffic Activity Data Base System |
| ATAP | Anti-Terrorism Assistance Program |
| ATB | All Terrain Bike |
| ATB | Articulated Tug and Barge |