| Abbreviation | Definition |
|---|---|
| ACE | Air Cleaning Engine |
| ACE | Airport Capacity Enhancement |
| ACE | Area Control Error |
| ACEP | Approved Continuous Examination Program for containers |
| ACES | Aircraft Configuration & Estimating System |
| ACF | Area Control Facility |
| ACFO | Air Canada Fleet Operations |
| ACFO | Association of Car Fleet Operators |
| ACHI | Adaptive Car Human Interface |
| ACHP | Advisory Committee On Highway Policy |
| ACI | Automated Car Identification |
| ACID | Analysis Console For Incident Databases |
| ACIP | Airport Capital Improvement Program |
| ACIS | Advance Cargo Information System |
| ACL | Angels Crucial Leg |
| ACLT | Actual Calculated Landing Time |
| ACM | Aviation Control Measure |
| ACNF | Anti-Cavity Noise Fix |
| ACOE | Army Corps Of Engineers |
| ACP | Airlines Control Program |