| Abbreviation | Definition |
|---|---|
| ALDF | Aircraft Landing Dynamics Facility |
| ALDO | Activity Level Dependent Operations |
| ALE | Airport Landing Equipment |
| ALE | Airport Lighting Equipment |
| ALERT | Acute Launch Emergency Reliability Tip |
| ALF | Alien Life Form |
| ALGOL | ALGOrithmic Language |
| ALIO | Activity Level Independent Operations |
| ALM | Alarm |
| ALPHA | Angle of Attack (Pitch) |
| ALPHA | Right Ascension |
| ALPS | Approach and Landing Procedures Simulator |
| ALRUTS | Automated Line Replaceable Unit Tracking System |
| ALS | Advance Logistics System |
| ALS | Advanced Launch System |
| ALS | Air Lock System |
| ALS | Alternate Landing Site |
| ALS | Automatic Landing System |
| ALSA | Astronaut Life Support Assembly |
| ALSARM | Advanced Life Support Automated Remote Manipulator |