| Abbreviation | Definition |
|---|---|
| ACAIS | Air Carrier Activity Information System |
| ACARS | Automatic Communications Addressing and Reporting System |
| ACAS | Airborne Collision Avoidance System |
| ACAS | Automotive Collision Avoidance System |
| ACC | Adaptive Control Constraint |
| ACC | Adaptive Cruise Control |
| ACC | Adaptive Cruise Control (Intelligent Transportation System ) |
| ACC | Adventure Concept Car |
| ACC | Air Center Commander |
| ACC | Aircraft Commander |
| ACC | Area Control Center |
| ACC | Auto Cruise Control |
| ACC/INC | Accident/Incident |
| ACCC | Area Control Computer Complex |
| ACCS | Arlington County Commuter Services |
| ACCT | Agency Council on Coordinated Transportation |
| ACD | Aviation Concept Development (FAA Engineering, Research, and Development Service) |
| A-CDM | airport-collaborative-decision-making |
| ACDO | Air Carrier District Office |
| ACE | Active Cornering Enhancement |