| Abbreviation | Definition |
|---|---|
| ARN | Airborne Radio Navigation |
| ARN | Aviation Reference Number |
| ARO | Airport Reporting Office |
| ARO | Airport Reservation Office |
| ARP | Airport Reference Point |
| ARPA | Automatic Radar Plotting Aid |
| ARPB | Airline Retiree Pass Bureau |
| ARPV | Advanced Remotely Piloted Vehicle |
| Arr. | arrival time |
| ARRG | Atlantic Region Reefers Group |
| ARS | Active Roll Stabilization |
| ARS | Adjustable Rate Suspension |
| ARS | Average Rectified Slope |
| ARSA | Airport Radar Service Area |
| ARSI | Automated Roadside Safety Inspection |
| ARSR | Air Route Surveillance Radar |
| ART | Air Reserve Technician |
| ART | Anaheim Resort Transit |
| ART | Anaheim Resort Transportation |
| ART | Arlington Transit |