| 1 | FO | Circle Air Freight Corp. | Designator FO recalled by IATA | USA | AVCODES |
| 2 | FO | Airlines of Tasmania Pty Ltd. | ICAO: ATM, Callsign: Airtas, Designator IP recalled by IATA | AUS | AVCODES |
| 3 | FO | Expedition Airways | ICAO: XPD, Callsign: Expedition, Designator FO* recalled by IATA | ZW | AVCODES |
| 4 | FO | Fred Olsen Flyselskap A/S | ICAO: FOF, Callsign: Fredolsen, | N | AVCODES |
| 5 | FO | Felix Airways | ICAO: FXX, Callsign: Felix, IATA Prefix: 569, Designator FO recalled by IATA. Founded 26 October 2008 | YAR | AVCODES |
| 6 | FO | F.B. Lineas Aereas S.A. t/a Flybondi | ICAO: FBZ, Callsign: Bondi, Commenced operations on 26 January 2018. | RA | AVCODES |
| 7 | FO | Aero Flightops UK Limited | ICAO: UKA, Callsign: Black Jet, | GB | AVCODES |
| 8 | FO | Furka-Oberalp | | CH | TRAFFIC |
| 9 | FOA | Filipinas Orient Airways, Inc. | Callsign: Fil Orient, | RP | AVCODES |
| 10 | FOA | Fortune Air (Pty) Ltd | Callsign: Fortune Air, | ZA | AVCODES |
| 11 | FOAC | FINA OIL & CHEMICAL COMPANY | | | SCAC3 |
| 12 | FOAF | FOOD SWING INC | | | SCAC4 |
| 13 | FOAI | FORT OIL CO INC | | | SCAC4 |
| 14 | FOAK | FLASH OIL COMPANY OF ARKANSAS CORP | | | SCAC4 |
| 15 | FOAM | FOAMEX L P | | | SCAC4 |
| 16 | FOAO | FOLDS, DAVID P JR | | | SCAC3 |
| 17 | FOAO | FOGHOLLOW EXPRESS | | | SCAC4 |
| 18 | FOAQ | FORT ATKINSON TRUCK LINE | | | SCAC3 |
| 19 | FOAQ | FOURNIER, MICHEL | | | SCAC4 |
| 20 | FOAR | FORAN, ARTHUR MOVER | | | SCAC3 |
| 21 | FOAR | FOUR CHIMNEYS FARM WINERY | | | SCAC4 |
| 22 | FOAW | FLORA INC | | | SCAC4 |
| 23 | FOB | Ford Motor Co. Ltd. | Callsign: Fordair, Ceased operations. | GB | AVCODES |
| 24 | FOB | Ford Motor Co. Ltd. | IATA: FD, Callsign: Fordair, Designator FD recalled by IATA. Name changed from Ford of Europe Incorporated | GB | AVCODES |
| 25 | FOB | Ford Motor Company | | | ICAO1 |
| 26 | FOBF | F O B FREIGHT WAREHOUSING INC | | | SCAC3 |
| 27 | FOBG | FOB TRANSPORTATION GROUP INC | | | SCAC3 |
| 28 | FOBM | FEDERAL/OBYRNE MOVING & STORAGE CO | | | SCAC3 |
| 29 | FOBO | FOLEY WAREHOUSING INC | | | SCAC3 |
| 30 | FOBR | FOSTER BROS TRUCKING INC | | | SCAC3 |
| 31 | FOBS | FORMAN, BEN & SONS INC | | | SCAC3 |
| 32 | FOBT | FORBES TRANSPORT INC | | | SCAC4 |
| 33 | FOBU | FROTA OCEANICA BRASILEIRA S.A. | | | SCAC3 |
| 34 | FOBX | Forbo Adhesives, LLC | added 4/2005; 7/2005 | | NAKINA |
| 35 | FOBX | Fruit Growers Express Co. | 1/1945-1/1975; eliminated 4/1975 | | NAKINA |
| 36 | FOBX | Fruit Growers Express Co. | 1/52-1/75; eliminated 4/75 | | NRHS |
| 37 | FOBX | *FRUIT GROWERS EXPRESS CO. | | | PWRC |
| 38 | FOBX | +FORBO ADHESIVES, LLC | | | PWRC |
| 39 | FOBX | FORBO ADHESIVES LLC | | | SCAC4 |
| 40 | FOC | Office Federal de Aviation Civile | Callsign: FOCA, | CH | AVCODES |
| 41 | FOCB | FRANCOIS OIL COMPANY INC | | | SCAC4 |
| 42 | FOCE | FOUR COLOR EXPRESS INC | | | SCAC3 |
| 43 | FOCE | FARMERS UNION OIL COMPANY OF RUGBY | | | SCAC4 |
| 44 | FOCF | F-SIXTEEN (F-16) ENTERPRISES LIMITE | | | SCAC4 |
| 45 | FOCH | FOOD CARRIER INC | | | SCAC3 |
| 46 | FOCI | FARMERS OIL CO INC | | | SCAC3 |
| 47 | FOCI | FROESEL OIL COMPANY INC | | | SCAC4 |
| 48 | FOCL | FOCUS LOGISTICS, INC | | | SCAC4 |
| 49 | FOCN | FALK OCEAN SHIPPING LIMITED | | | SCAC3 |
| 50 | FOCN | FRISCO INTL INC | | | SCAC4 |
| 51 | FOCO | FORDS CONTRACTING SERVICE | | | SCAC3 |
| 52 | FOCP | FICKLER OIL COMPANY INC | | | SCAC4 |
| 53 | FOCU | UNISOURCING CO LIMITED | | HK | BIC |
| 54 | FOCU | OLDENBURG-PORTUGIESICHE DAMPFSCHIFF | | | SCAC4 |
| 55 | FOCW | FAMILY OIL COMPANY LLC | | | SCAC4 |
| 56 | FOCY | FIVE THREE ZERO NINE SEVEN EIGHT (5 | | | SCAC4 |
| 57 | FOD | Spolek „Frýdlantské okresní dráhy\" | | CZ | VKM |
| 58 | FODB | FOSTORIA DISTRIBUTION SERVICES | | | SCAC3 |
| 59 | FODC | FOOD CARRIER INC | | | SCAC3 |
| 60 | FODC | FOOD CITY | | | SCAC4 |
| 61 | FODE | FORWARD EXPRESS TRUCKING CO | | | SCAC3 |
| 62 | FODE | FRIED-SPED LOGISTICS LLC | | | SCAC4 |
| 63 | FODI | FILON COMPANY LIMITED | | | SCAC4 |
| 64 | FODL | FORST, DONALD | | | SCAC3 |
| 65 | FODN | FRANKEN OIL & DISTRIBUTING CO INC | | | SCAC4 |
| 66 | FODR | FORDE TRANSPORT CO | | | SCAC3 |
| 67 | FODR | FOURNIERS DOOR AND WINDOW LLC | | | SCAC4 |
| 68 | FODT | FOODTRAIN INC | | | SCAC3 |
| 69 | FODU | ALLIANCEUROPE | | F | BIC |
| 70 | FODY | FORDYCE, JAMES B | | | SCAC3 |
| 71 | FOE | Fly One Airlines S.r.l. | IATA: OE, Callsign: First Eagle, | RO | AVCODES |
| 72 | FOEC | FOREST CARTAGE INC | | | SCAC3 |
| 73 | FOEE | FORTY EIGHT EXPRESS INC (48 EXPRESS | | | SCAC3 |
| 74 | FOEL | FOSTER, EMORY L TRUCKING | | | SCAC3 |
| 75 | FOEM | FUEL OIL & EQUIPMENT CO INC | | | SCAC3 |
| 76 | FOEN | FORMULA ONE EXPRESS INC | | | SCAC3 |
| 77 | FOEN | FOUR ONE EIGHT SIX | | | SCAC4 |
| 78 | FOEP | FOOD EXPRESS INC | | | SCAC3 |
| 79 | FOEQ | FORD ERNEST TRUCKING | | | SCAC3 |
| 80 | FOER | FORTIER TRANSPORTATION CO LTD | | | SCAC3 |
| 81 | FOES | FOWLKES MOTOR FREIGHT LINES | | | SCAC3 |
| 82 | FOES | FOUR ONE EIGHT SIX FOUR ZERO ONE (4 | | | SCAC4 |
| 83 | FOET | FOE TRUCKING INC | | | SCAC3 |
| 84 | FOEW | FIVE (5) OCEANS EXPRESS LLC | | | SCAC4 |
| 85 | FOF | Fred Olsen Flyselskap A/S | IATA: FO, Callsign: Fredolsen, | N | AVCODES |
| 86 | FOF | Flyfofo Airways | Callsign: Fofa, | ZA | AVCODES |
| 87 | FOFA | FRANKS OF AMSTERDAM | | | SCAC3 |
| 88 | FOFD | FOREMOST FORWARDERS INC | | | SCAC3 |
| 89 | FOFE | FORFAR ENTERPRISES LTD | | | SCAC3 |
| 90 | FOFG | FORD FORWARDING | | | SCAC3 |
| 91 | FOFI | FORTY FIFTH (45TH) STREET MANAGEMEN | | | SCAC3 |
| 92 | FOFL | FRONTIER FREIGHTLINER | | | SCAC3 |
| 93 | FOFL | FRT INTERNATIONAL | | | SCAC4 |
| 94 | FOFM | FREDS OF MERIDAN INC | | | SCAC3 |
| 95 | FOFP | FOFEX | | | SCAC4 |
| 96 | FOFR | FORTY FOUR TRANSPORT CORP (44 TRANS | | | SCAC3 |
| 97 | FOFR | FOLEY, FLORENT | | | SCAC4 |
| 98 | FOFS | FOWSER FAST FREIGHT, INC | | | SCAC3 |
| 99 | FOFS | FREEDOM OIL FIELD SEVICES LLC | | | SCAC4 |
| 100 | FOFT | FORREST FREEZE TRUCKING INC | | | SCAC3 |
