| Abbreviation | Definition |
|---|---|
| FNB | Frequency - Narrow Band |
| FND | Facility Need Date |
| FNL | FiNaL |
| FNT | Failure Notification Telex |
| FO | Fail Operational |
| FO | Functional Objective |
| FO/FS | Fail-Operational/Fail-Safe |
| FOB | Flight Operations Building |
| FOBS | Flight Operations Briefing Station |
| FOC | FOCus |
| FOD | Flight Operations Directorate |
| FOE | Flight Operations Engineer |
| FOF | First Operational Flight |
| FOF | First Orbital Flight |
| FOF | Flight Operations Facilities |
| FOG | Feet On Ground |
| FOIH | Flight Operations Integration Handbook |
| FOLAN | Flight Operations Local Area Network |
| FOMR | Flight Operations Management Room |
| FOP | Flight Operations Panel |