F - Fahrenheit 
F - Fault 
F - First class 
F - Flap 
F - Forward 
F - Foxtrot 
F - Freighter 
f - frequency 
F - Fuel 
F-BFTS - France-Belgium Flying Trainin… 
F-PLN - Flight Plan 
F.DES - Final Descent 
f/a - flight attendant 
F/C - First Class 
F/C - flight control 
F/C - Flight Crew 
F/C - Fully Closed 
F/D - Flight Director 
F/D - Fuselage Datum 
F/E - Flight Engineer 
F/F - Fuel Flow 
F/L - Flight Lieutenant 
F/O - First Officer 
F/O - Flying Officer 
F/S - Fast/Slow 
F/S - Flight Sergeant 
F/U - follow-up 
F/W - Failure Warning 
F9 - Frontier Airlines 
FA - Flight Attendant