| 1 | FL | AirTran Airways, Inc. | ICAO: TRS, Callsign: Citrus, IATA Prefix: 332, Fully integrated into Southwest Airlines on 28 December 2014. Commenced operations on 17 November 1997. ICAO designator changed from MTE. On September 27, 2010, Southwest Airlines announced they would acquire AirTran Airways. | USA | AVCODES |
| 2 | FL | AirTran Airways, Inc. | ICAO: MTE, Callsign: Manatee, IATA Prefix: 332, ICAO designator changed to TRS | USA | AVCODES |
| 3 | FL | Frontier Airlines | Callsign: Frontier, Ceased operations | USA | AVCODES |
| 4 | FL | AirTran Airways, Inc. | ICAO: MTE, Callsign: Citurs, IATA Prefix: 332, ICAO designator changed to TRS | USA | AVCODES |
| 5 | FL | Air Large European Aviation Project t/a Air Leap | ICAO: LPA, Callsign: Leap, Ceased operation on 24 January 2022 and filed for reorganisation. | S | AVCODES |
| 6 | FL | FAMILY LINES SYSTEM | | | PWRC |
| 7 | FL | Family Lines System | | | RSRV |
| 8 | FL | FITCHBURG AND LEOMINSTER STREET RAI | | | SCAC4 |
| 9 | FL | Freightliner (GB) | Freightliner is a British freight operating company, founded in 1995. It is the second largest railfreight operator, after EWS. The origins of the Freightliner concept go back to the mid-1960's British Rail under Richard Beeching. As part of an overall modernisation and rationalisation programme, British Rail began moving freight using ISO containers on flat wagons between a series of dedicated inland terminals using gantry cranes for transhipment from road to rail. Although initially intended for domestic freight, this was soon overtaken by freight between deep sea ports, such as Southampton Maritime an and inland distribution terminals associated with centres of manufacturing or population such as Birmingham Landor Street. In 1995, Freightliner was privatised as a stand alone company, being bought out by its own management. | GB | TRAFFIC |
| 10 | FL | Freightliner | | UK | VKM |
| 11 | FLA | Midway Express | Callsign: Palm, | USA | AVCODES |
| 12 | FLA | Air Florida | IATA: QH, Callsign: Palm, Ceased operations on 03 July 1984. | USA | AVCODES |
| 13 | FLA | S.C. Fly 365 Aviation S.r.l. | Callsign: Su Air, | RO | AVCODES |
| 14 | FLA | Fly AO-Linhas Aereas, Limiteda d/b/a Fly AO Angola | IATA: EQ, | ANG | AVCODES |
| 15 | FLA | Flite Aviation Limited t/a Flite | Callsign: Bluerock, | M | AVCODES |
| 16 | FLA | Midway Express | | | ICAO1 |
| 17 | FLA | Freightliner Australia | | AUS | TRAFFIC |
| 18 | FLAA | FLEMING EQUIPMENT SERVICES INC | | | SCAC4 |
| 19 | FLAB | FLATBUSH MOVING VAN CO, INC | | | SCAC3 |
| 20 | FLAC | FLOOD AND ASSOCIATES | | | SCAC3 |
| 21 | FLAC | FOX LOGISTICS | | | SCAC4 |
| 22 | FLAD | FLATLAND FREIGHT DISTRIBUTORS, INC | | | SCAC3 |
| 23 | FLAE | FLORIDA ASSEMBLY & DISTRIBUTION INC | | | SCAC3 |
| 24 | FLAG | FLAUGH, C P, COMPANY, INC | | | SCAC3 |
| 25 | FLAG | FLAGSTONE LOGISTICS, LLC | | | SCAC4 |
| 26 | FLAG | | City: Frankfurt/M | D | TRAFFIC |
| 27 | FLAI | FLUID TRANSPORTS INC | | | SCAC4 |
| 28 | FLAIR | Fürstlich Liechtensteinische Eisenbahn-Romantik Stiftung | | AT | VKM |
| 29 | FLAJ | FAST LINE TRUCKING INC | | | SCAC4 |
| 30 | FLAL | FLORAL PLANT GROWERS LLC | | | SCAC4 |
| 31 | FLAM | FLAMINGO HAULING & RIGGING CO | | | SCAC3 |
| 32 | FLAM | FLAMINI TRUCKING CO | | | SCAC4 |
| 33 | FLAM | Flamsbana | | N | TRAFFIC |
| 34 | FLAN | FLO TRANS | | | SCAC4 |
| 35 | FLAP | FLASH FREIGHT SYSTEMS | | | SCAC4 |
| 36 | FLAQ | FOUR (4) LANDS TRANSPORTATION CO | | | SCAC4 |
| 37 | FLAR | FLORIDA REFRIGERATED SERVICE | | | SCAC3 |
| 38 | FLAS | FLETES Y MUDANZAS DE REYNOSA SA DE | | | SCAC4 |
| 39 | FLAT | FLATTS TRUCK SERVICE INC | | | SCAC3 |
| 40 | FLAU | FLORIDA LINES | | | SCAC3 |
| 41 | FLAX | Flexsys America L.P. | 7/2000-7/2005 | | NAKINA |
| 42 | FLAX | Flexsys America L.P. | Jul-00 | | NRHS |
| 43 | FLAX | FLEXSYS AMERICA L.P. | | | PWRC |
| 44 | FLAX | Flexsys America | | | RSRV |
| 45 | FLAY | FORTSON, LAWYER TRUCKING | | | SCAC3 |
| 46 | FLAY | FOREST LINES | | | SCAC4 |
| 47 | FLAZ | FLEXI-VAN LEASING | | | PWRC |
| 48 | FLAZ | Flexi-Van Leasing | | | RSRV |
| 49 | FLAZ | FLORIDA LINES | | | SCAC3 |
| 50 | FLAZ | FLEXI-VAN LEASING INC | | | SCAC4 |
| 51 | FLB | Fly S.A. Linhas Aereas | IATA: 4H, Callsign: Aereafly, | BR | AVCODES |
| 52 | FLB | Fly Art Aviation | IATA: T2, Callsign: Rossignol, | TCH | AVCODES |
| 53 | FLBB | FLATBED SOLUTIONS | | | SCAC4 |
| 54 | FLBF | FALCON DISTRIBUTION | | | SCAC4 |
| 55 | FLBG | FEVER LOGISTIC TRANSPORT LTD | | | SCAC4 |
| 56 | FLBH | FLS TRANSPORT INC | | | SCAC4 |
| 57 | FLBI | FLEMING-BABCOCK INC | | | SCAC3 |
| 58 | FLBI | FLEMING BABCOCK INC | | | SCAC4 |
| 59 | FLBL | FALCON SHIPPING LLC | | | SCAC4 |
| 60 | FLBN | FLY BY NITE FAST FREIGHT CO INC | | | SCAC3 |
| 61 | FLBN | FUELMAN INC | | | SCAC4 |
| 62 | FLBO | FLANAGAN BROTHERS TRUCKING INC | | | SCAC3 |
| 63 | FLBO | FLANAGAN BROTHERS TRUCKING INC | | | SCAC4 |
| 64 | FLBP | FORWARD LOGISTICS INC | | | SCAC4 |
| 65 | FLBQ | FILBAR FURNITURE MFG CO INC | | | SCAC3 |
| 66 | FLBQ | FAST LANE FREIGHT CARRIER INC | | | SCAC4 |
| 67 | FLBR | FLANAGIN BROTHERS INC | | | SCAC3 |
| 68 | FLBR | FURLAN BROS SALES & LEASING | | | SCAC4 |
| 69 | FLBS | FRONTIER LOGISTICS SERVICES | | | SCAC4 |
| 70 | FLBT | FOLKERTS BROS TRUCKING INC | | | SCAC3 |
| 71 | FLBU | FLOSIT | | MA | BIC |
| 72 | FLBU | FAIRBREEZE SHIPPING COMPANY | | | SCAC3 |
| 73 | FLBU | FLOSIT | | | SCAC4 |
| 74 | FLBV | FRONTIER LOGISTICS INC | | | SCAC4 |
| 75 | FLBW | FEARLESS LEASING INC | | | SCAC4 |
| 76 | FLBY | FOUR (4 ) L EQUIPMENT LEASING LLC | | | SCAC4 |
| 77 | FLC | FINFO Flight Inspection Aircraft | Callsign: Flight Check, Name changed to US Department of Transport, Federal Aviation Administration, Flight Inspection Services. | USA | AVCODES |
| 78 | FLC | United States Department of Transport, Federal Aviation Administration, Flight Inspection Services. | Callsign: Flight Check, Name changed from FINFO Flight Inspection Aircraft | USA | AVCODES |
| 79 | FLC | FINFO Flight Inspection Aircraft | | | ICAO1 |
| 80 | FLCB | FALCON TRANSPORTATION | | | SCAC3 |
| 81 | FLCC | FLEET CONCEPTS INC | | | SCAC4 |
| 82 | FLCE | FLEET CARRIERS INC | | | SCAC3 |
| 83 | FLCF | FLESCH, ANDREW FRANCIS | | | SCAC3 |
| 84 | FLCG | FLORIDA CITRUS GROVES CORPORATION | | | SCAC3 |
| 85 | FLCGK | Pfeifer & Langen Glinojeck S.A. | | PL | VKM |
| 86 | FLCH | FLETCHER, WARREN D | | | SCAC3 |
| 87 | FLCI | FALCO INC | | | SCAC3 |
| 88 | FLCI | FREEDOM LOGISTICS CORPORATION | | | SCAC4 |
| 89 | FLCJ | FLEECS, J F INC | | | SCAC3 |
| 90 | FLCJ | FALLS, MICHAEL | | | SCAC4 |
| 91 | FLCK | FLORIDA CONTAINER TRANSPORT INC | | | SCAC3 |
| 92 | FLCL | FALCONE, TOM INC | | | SCAC3 |
| 93 | FLCL | FLETERA LOS ALACRANES | | | SCAC4 |
| 94 | FLCM | FALCON MOTOR XPRESS LTD | | | SCAC4 |
| 95 | FLCN | FALCON ITALIAN AIR CARGO CONSOLIDAT | | | SCAC3 |
| 96 | FLCN | FOREX LUMBER COMPANY | | | SCAC4 |
| 97 | FLCO | FELCO TRANSPORTATION CO INC | | | SCAC3 |
| 98 | FLCO | FRONTIER LOGISTICAL SERVICES LLC | | | SCAC4 |
| 99 | FLCQ | FLEMCO DELIVERY SERVICE, INC | | | SCAC3 |
| 100 | FLCQ | FLC TRUCKING | | | SCAC4 |
