| Abbreviation | Definition |
|---|---|
| C2CWG | Center-to-Center Working Group |
| CA | Cab to Axle |
| CA | CAncelled |
| CA | Conflict Alert |
| CA | Contract Air |
| CA/MSAW | Conflict Alert/Minimum Safe Altitude Warning |
| CAA | Cancel All Aviation |
| CAA | Civil Aviation Authority |
| CAA | Clean Air Act |
| CAAS | Civil Aviation Authority of Singapore |
| CAASD | Centre for Advanced Aviation System Development |
| CAATS | California Alliance for Advanced Transportation Systems |
| CAB | Civil Aeronautics Board |
| CABS | Crashworthy Air Bag System |
| CACT | Citizens Advisory Committee on Transportation |
| CACV | Camallino Armored Combat Vehicle |
| CACV | Collect America Collection Vehicle |
| CAD | Computer-Aided Dispatch system |
| CADAR | Cambridgeshire Advanced Drivers and Riders |
| CADLAS | Computer Assisted Depreciation and Life Analysis System |