| Abbreviation | Definition |
|---|---|
| ATCMD | Advanced Transportation Control Movement Document |
| ATCO | Air Taxi Commercial Operator |
| ATCO | Air Traffic Control Officer |
| ATCO | Arnold Transit Company |
| ATCRBS | Air Traffic Control Radar Beacon System |
| ATCSCC | Air Traffic Control System Command Center |
| ATCT | Air Traffic Control Tower |
| ATCT | Airport Traffic Control Tower |
| ATD | Actual Time of Departure |
| ATD | Anthropomorphic Test Device |
| ATDM | Active Transportation and Demand Management |
| ATE | Actual Time Enroute |
| ATE | Automatic Test Equipment |
| ATEC | Advanced Transportation Energy Center |
| ATEN | Arizona Traffic and Emergency Net |
| ATF | Automatic Transmission Fluid |
| ATF | Automatic Transmission Ford |
| ATFI | Alliance for Toll-Free Interstates |
| ATGATT | All The Gear All The Time |
| ATIP | Area Transportation Improvement Program |