| 1 | KF | Oy Air Botnia AB | ICAO: KFB, Callsign: Botnia, IATA Prefix: 142, Name changed to Blue 1 in January 2004. ICAO callsign changed to Bluefinn | FIN | AVCODES |
| 2 | KF | Congofrigo | Callsign: Congofrigo, | ZAR | AVCODES |
| 3 | KF | Blue1 Oy | ICAO: KFB, Callsign: Bluefinn, IATA Prefix: 142, Name changed from Oy Air Botnia AB. ICAO designator changed to BLF. ICAO callsign changed to Bluefinn | FIN | AVCODES |
| 4 | KF | Blue1 Oy | ICAO: BLF, Callsign: Bluefinn, IATA Prefix: 142, Designator KF recalled by IATA. Sold to CityJet in October 2015. Name changed from Oy Air Botnia AB. ICAO designator changed from KFB. ICAO callsign changed from Botnia | FIN | AVCODES |
| 5 | KF | Air Flight Luftfahrt GmbH | ICAO: KFK, Callsign: Air Flight, Name changed to German Wings Luftfahrtunternehman GmbH | D | AVCODES |
| 6 | KF | German Wings Luftfahrtunternehman GmbH | ICAO: KFK, Callsign: German Wings, Name changed to Air Flight Luftfahrt GmbH | D | AVCODES |
| 7 | KF | Air Belgium SA | ICAO: ABB, Callsign: Air Belgium, | B | AVCODES |
| 8 | KFA | Kelowna Flightcraft International Air Cargo Ltd. d/b/a Winnport Air Cargo | IATA: W8, Callsign: Flightcraft, IATA Prefix: 489, IATA designator changed from KN | CDN | AVCODES |
| 9 | KFA | Kelowna Flightcraft International Air Cargo Ltd. d/b/a Winnport Air Cargo | IATA: KN, Callsign: Flightcraft, IATA designator changed to W8 | CDN | AVCODES |
| 10 | KFA | Kelowna Flightcraft Air Charter Ltd. | IATA: KW, Callsign: Flightcraft, IATA Prefix: 194, IATA designator changed to FK. Designator KW* reinstated by IATA | CDN | AVCODES |
| 11 | KFA | Kelowna Flightcraft Air Charter Ltd. | IATA: FK, Callsign: Flightcraft, IATA Prefix: 758, IATA designator changed from KW*. Designator KW* reinstated by IATA | CDN | AVCODES |
| 12 | KFA | Kelowna Flightcraft Air Charter | | | ICAO1 |
| 13 | KFAM | KARNI FAMILY FARM LLC | | | SCAC4 |
| 14 | KFAR | KOKOSA FUELS INC | | | SCAC4 |
| 15 | KFAS | KNOWLES FARMS | | | SCAC4 |
| 16 | KFAY | KELBLEY TRANSPORTATION LIMITED | | | SCAC4 |
| 17 | KFB | Oy Air Botnia AB | IATA: KF, Callsign: Botnia, IATA Prefix: 142, Name changed to Blue 1 in January 2004. ICAO callsign changed to Bluefinn | FIN | AVCODES |
| 18 | KFB | Blue1 Oy | IATA: KF, Callsign: Bluefinn, IATA Prefix: 142, Name changed from Oy Air Botnia AB. ICAO designator changed to BLF. ICAO callsign changed to Bluefinn | FIN | AVCODES |
| 19 | KFB | Superior Transportation Associates, Inc d/b/a STAjets | Callsign: Mission, | USA | AVCODES |
| 20 | KFBE | Köln-Frechen-Benzelrather Eisenbahn GmbH | City: Köln | D | TRAFFIC |
| 21 | KFBK | KF BROKERAGE LLC | | | SCAC4 |
| 22 | KFBL | KENTUCKY FLATBEDS LLC | | | SCAC4 |
| 23 | KFBS | KELLEY FREIGHT BROKERS | | | SCAC4 |
| 24 | KFBZ | K & F BRICK COMPANY | | | PWRC |
| 25 | KFC | Kremenchuk Flight College | Callsign: Kremenchuk, | UA | AVCODES |
| 26 | KFC | Kremenchuk Flight College | | | ICAO1 |
| 27 | KFCC | K-FIVE CONSTRUCTION CORP | | | SCAC3 |
| 28 | KFCC | K-FIVE CONSTRUCTION CORP | | | SCAC4 |
| 29 | KFCL | KINGFIELD COMPANY LTD., | | | SCAC3 |
| 30 | KFCL | K F EXPRESS INC | | | SCAC4 |
| 31 | KFCM | KASILOF FISH COMPANY | | | SCAC4 |
| 32 | KFCR | KHUSHI FREIGHT CARRIER | | | SCAC4 |
| 33 | KFCS | KNIGHT FLIGHT CARGO SERVICES INC | | | SCAC4 |
| 34 | KFCT | KREIFELS TRUCKING LLC | | | SCAC4 |
| 35 | KFCY | KINGDOM FREIGHT COMPANY | | | SCAC4 |
| 36 | KFCZ | KENT FEED COMPANY | | | PWRC |
| 37 | KFDG | KOCH FOODS OF GAINESVILLE LLC | | | SCAC4 |
| 38 | KFDI | KLEINBERG, FRANK S DISTRIBUTORS INC | | | SCAC3 |
| 39 | KFDI | KRINOS FOODS INC | | | SCAC4 |
| 40 | KFDL | KINGSFORD LINES III LTD | | | SCAC3 |
| 41 | KFDL | KIDKRAFT | | | SCAC4 |
| 42 | KFDY | KAN FLY DELIVERY | | | SCAC4 |
| 43 | KFE | Skyfree Ltd. | Callsign: Skyfree, Name changed to Skyfirst Ltd. ICAO Callsign changed to Morito. | M | AVCODES |
| 44 | KFE | Skyfirst Ltd. | Callsign: Morito, Name changed from Skyfree Ltd. ICAO Callsign changed to Skyfree. | M | AVCODES |
| 45 | KFE | Skyfirst Ltd. | Callsign: Morito, Name changed from Skyfree Ltd. ICAO Callsign changed to Skyfree. | M | AVCODES |
| 46 | KFEC | K FIVE (5) EXPRESS INC | | | SCAC4 |
| 47 | KFFA | KENNEDY FUEL & FEED INC | | | SCAC4 |
| 48 | KFFC | K F F INC | | | SCAC3 |
| 49 | KFFI | K F F I TRUCKING INC | | | SCAC3 |
| 50 | KFFL | KLEEFELD FARM SALES | | | SCAC4 |
| 51 | KFFM | KEY FACTOR FREIGHT MANAGEMENT INC | | | SCAC4 |
| 52 | KFFN | KFF INC | | | SCAC3 |
| 53 | KFFS | KAUFFS TRANSPORTATION SYSTEMS | | | SCAC4 |
| 54 | KFFT | KACHEMAK FAST FREIGHT | | | SCAC3 |
| 55 | KFFT | KRAFFT TRUCKING INC | | | SCAC4 |
| 56 | KFGR | KOCHER FLOWER GROWERS | | | SCAC4 |
| 57 | KFGX | Knauf Fiber Glass, GmbH | added 4/1978; 1/1980; eliminated 7/1987; 1/1994-7/2005 (not listed) | | NAKINA |
| 58 | KFGX | Knauf Fiber Glass, GmbH | added 4/78; 1/80; eliminated 7/87; 1/94-7/2000 | | NRHS |
| 59 | KFGX | KNAUF FIBER GLASS, GmbH | | | PWRC |
| 60 | KFGX | Knauf Fiber Glass | | | RSRV |
| 61 | KFGX | KNAUF FIBERGLASS, GMBH | | | SCAC4 |
| 62 | KFHA | KJ FREIGHT HAULER LLC | | | SCAC4 |
| 63 | KFHB | KFH | | | SCAC4 |
| 64 | KFHD | KFH DELIVERY SERVICE, INC | | | SCAC3 |
| 65 | KFIC | KODIAK FRET INTERNATIONAL INC | | | SCAC4 |
| 66 | KFID | KISWANI FREIGHT INC | | | SCAC4 |
| 67 | KFIE | KR FREIGHTWAY INC | | | SCAC4 |
| 68 | KFIH | KETTLE FISH INC | | | SCAC4 |
| 69 | KFIM | KRIZAN FARM INC | | | SCAC4 |
| 70 | KFIN | KEA-FIN INC | | | SCAC3 |
| 71 | KFIT | KASPER FACTOR INC, THE | | | SCAC4 |
| 72 | KFIV | KAPPERS FABRICATING INC | | | SCAC4 |
| 73 | KFIX | J & J Railcar Leasing, LLC | 7/2005 (not listed); added 4/2009 | | NAKINA |
| 74 | KFIX | J & J RAILCAR LEASING, LLC | | | PWRC |
| 75 | KFIX | J & J RAILCAR LEASING LLC | | | SCAC4 |
| 76 | KFIX | J & J Railcar Leasing, LLC | | USA | TRAFFIC |
| 77 | KFK | German Wings Luftfahrtunternehman GmbH | IATA: PW, Callsign: German Wings, Ceased operations. Name changed to Air Flight Luftfahrt GmbH | D | AVCODES |
| 78 | KFK | Aero Charter Krifka Ges mbH | Callsign: Krifka Air, | A | AVCODES |
| 79 | KFK | Air Flight Luftfahrt GmbH | IATA: KF, Callsign: Air Flight, Name changed to German Wings Luftfahrtunternehman GmbH | D | AVCODES |
| 80 | KFK | German Wings Luftfahrtunternehman GmbH | IATA: KF, Callsign: German Wings, Name changed to Air Flight Luftfahrt GmbH | D | AVCODES |
| 81 | KFK | Aero Charter Krifka | | | ICAO1 |
| 82 | KFL | Flamingo Airways Limited | IATA: YS, Callsign: Nakuru, IATA designator changed to F7. Subsidiary of Kenya Airways | EAK | AVCODES |
| 83 | KFL | Flamingo Airways Limited | IATA: F7, Callsign: Nakuru, ICAO callsign changed to Batian / IATA designator changed from YS*. Subsidiary of Kenya Airways | EAK | AVCODES |
| 84 | KFL | Flamingo Airways Limited | IATA: F7, Callsign: Batian, ICAO callsign changed from Nakuru / IATA designator changed from YS*. Subsidiary of Kenya Airways | EAK | AVCODES |
| 85 | KFLC | KOCH & FIELDS LLC | | | SCAC4 |
| 86 | KFLD | KING FREIGHT LINES LIMITED (LOCAL D | | | SCAC4 |
| 87 | KFLH | KFL HAWAIIAN INC | | | SCAC3 |
| 88 | KFLI | KUSTOM FREIGHTLINES LLC | | | SCAC4 |
| 89 | KFLL | KIRK FREIGHT LINE LTD | | | SCAC3 |
| 90 | KFLN | KINGMAN DEDICATED SERVICE INC | | | SCAC4 |
| 91 | KFLO | KF LOGISTICS INC | | | SCAC4 |
| 92 | KFML | KOLA FEED MILL LTD | | | SCAC4 |
| 93 | KFMS | KAPALUA FUEL & MARINE SERVICES INC | | | SCAC4 |
| 94 | KFMT | KFM TRANSPORT | | | SCAC4 |
| 95 | KFMX | Oils Unlimited | 1/1975-1/1994; 7/2000-7/2005 (not listed) | | NAKINA |
| 96 | KFMX | The Kansas Flour Mills Co. | 7/1923 | | NAKINA |
| 97 | KFMX | Oils Unlimited | 1/75-7/2000 | | NRHS |
| 98 | KFMX | *KANSAS FLOUR MILLS CO. | | | PWRC |
| 99 | KFMX | +OILS UNLIMITED | | | PWRC |
| 100 | KFMX | Kansas Flour Mills (Oils Unlimited) | | | RSRV |
