| Term | Definition / Meaning / Stand for |
| CEAFAR |
CE Active Phased Array Radar |
| CSDU |
Cabin Service Distribution Unit |
| CSP |
Cabin Surveillance Program |
| CTT |
Cabin Temperature and Humidity Control |
| CSA |
Canadian Space Agency |
| CNL |
Cancel Flight Plan |
| CDS |
Cargo Delivery System |
| CLS |
Cargo Loading System |
| CZA |
Cargo Zone Area |
| CV |
Carrier Vessel |
| CWT |
Center Wing Tank |
| CL |
Centerline |
| CMC |
Central Maintenance Computer |
| CWP |
Central Warning Panel |
| COA |
Certificate of Authorization |
| CCAR |
Civil Aviation Regulations (China) |
| CEAOPS |
Civil Emergency Air Operations |
| CWG |
Civil Weather Guidance |
| CCI |
Cockpit Control Interface |
| CCAS |
Cockpit Control and Automation System |
| CCL |
Cockpit Crew List |
| CICS |
Cockpit Integrated Control System |
| CPI |
Cockpit Procedure Instructor |
| CRS |
Cockpit Recording System |
| CSI |
Cockpit System Interface |
| CAI |
Collision Avoidance Indicator |
| CRA |
Collision Risk Assessment |
| CSM |
Command and Service Module |
| CST |
Commercial Space Transportation |
| CCF |
Common Cause Failure |
| CNS |
Communication, Navigation, and Surveillance |
| COM |
Communication |
| CGL |
Compass Guided Landing |
| CCA |
Composite Crew Agreement |
| CAD |
Computer-Aided Design |
| CIRRUS |
Computerized Information for the Regulation and Reporting of Unusual Situations |
| CVT |
Computerized Voice Transmission |
| CNF |
Conditional Navigation Fix |
| CCO |
Continuous Climb Operations |
| CEM |
Continuous Emission Monitoring |
| CLAW |
Control Law |
| CZ |
Control Zone |
| CTS |
Control and Test System |
| CTR |
Controlled Terminal Region |
| CTA |
Controlled Traffic Area |
| CTOL |
Conventional Takeoff and Landing |
| CHAMP |
Counter-electronics High Power Microwave Advanced Missile Project |
| CCM |
Crew Coordination Manual |
| CXP |
Crew Experience Program |
| CIM |
Crew Interface Module |
| CSO |
Crew Scheduling Officer |
| CTP |
Crew Training Program |
| CWR |
Crew Workload Reduction |
| CAW |
Critical Aerospace Warning |
| CDR |
Critical Design Review |
| CSB |
Critical Safety Board |
| CTM |
Critical Time Management |
| CT |
Cruise Thrust |
| COB |
Cut-Off Board |
| CIDS |
Cabin Intercommunication Data System |
| CPT |
Captain |
| CFRP |
Carbon Fibre Reinforced Polymer |
| COD |
Carrier Onboard Delivery |
| CSG |
Carrier Strike Group |
| CVF |
Carrier Vessel Future |
| CAVU |
Ceiling and Visibility Unlimited |
| CG |
Center of Gravity |
| COG |
Center of Gravity |
| CoG |
Center of Gravity |
| CFMU |
Central Flow Management Unit |