| F | Degrees Fahrenheit |
| F | Fixed; Flasher or Flashing (lighting) |
| FAA | Flight Advisory Area (US FIR) |
| FAA | Federal Aviation Administration |
| FAC | Facility |
| FAC | Final Approach Course |
| FAF | Final Approach Fix |
| FAL | Facilitation of International Air Transport |
| FAM | Family of Frequencies |
| FAP | Final Approach Point |
| FAPA | Final Approach Profile Angle |
| FAR | Federal Aviation Regulation |
| FAS | Final Approach Segment |
| FAT | Final Approach Track |
| FAX | Facsimile Transmission |
| FCP | Final Control Point |
| FCST | Forecast |
| FEB | February |
| FEG | Flight Engineer Ground Handling |
| FIC | Flight Information Centre |
| FIR | Flight Information Region |
| FIS | Flight Information Service |
| FISA | Automated Flight Information Service |
| FL | Flight Level |
| FLD | Field |
| FLG | Flashing |
| FLI | Flight Operations Manual (LH) |
| FLIP | Flight Information Publication |
| FLT | Flight |
| FLTCK | Flight check |
| FLUC | Fluctuating; Fluctuation or fluctuated |
| FLW | Follow(s)/following |
| FLY | Fly; Flying |
| FM | Fan Marker |
| FM | From |
| FMS | Flight Management System |
| FOB | Fuel on Board (Endurance) |
| FOM | Flight Operations Manual |
| FPL | Filed Flight Plan Message |
| FPM/fpm | Feet per Minute |
| FPR | Flight Planning Requirement |
| FREQ | Frequency |
| FRI | Friday |
| FRNG | Firing |
| FRQ | Frequent |
| FSL | Full Stop Landing |
| FSS | Flight Service Station |
| FST | First |
| FSU | Flight Service Unit (Australia) |
| FT/ft | Foot; Feet |
| FTS | Flexible Track System |
