| 1 | KY | Linhas Aereas de Air Sao Tome And Principe | ICAO: EQL, Callsign: Equatorial, IATA Prefix: 980, Designator KY recalled by IATA. Designator KY reinstated by IATA | STP | AVCODES |
| 2 | KY | Kasturi and Sons | | IND | AVCODES |
| 3 | KY | West Afica AirCargo | | GH | AVCODES |
| 4 | KY | Kunming Airlines Co., Ltd. | ICAO: KNA, Callsign: Kunming Air, IATA Prefix: 833, | PRC | AVCODES |
| 5 | KYA | Yana Air Cargo (Kenya) Limited | Callsign: Yana Air, | EAK | AVCODES |
| 6 | KYAE | KIRBY & ALDRIDGE | | | SCAC3 |
| 7 | KYAG | KEYTRADE AG | | | SCAC4 |
| 8 | KYAJ | KELLEY, ALAN J | | | SCAC4 |
| 9 | KYAL | KARRY ALL TRANSPORTATION INC | | | SCAC3 |
| 10 | KYAL | KARRY ALL TRANSPORTATION INC | | | SCAC4 |
| 11 | KYAP | KINGSBURY, ALAN P | | | SCAC4 |
| 12 | KYAV | KEY AVIATION | | | SCAC3 |
| 13 | KYAV | KEYSTONE LOGISTICAL SERVICES INC | | | SCAC4 |
| 14 | KYB | Skybridge Airops S.R.L. | Callsign: Sky Airops, | I | AVCODES |
| 15 | KYB | Skybridge Airops | | | ICAO1 |
| 16 | KYBA | KYBATO INC | | | SCAC3 |
| 17 | KYBC | KEYES FIBRE CORPORATION | | | SCAC4 |
| 18 | KYBO | KYBER OUTERWEAR CORP | | | SCAC4 |
| 19 | KYBT | KYBURZ TRUCKING | | | SCAC4 |
| 20 | KYC | Av Atlantic | Callsign: Dolphin, | USA | AVCODES |
| 21 | KYC | Av Atlantic | | | ICAO1 |
| 22 | KYCI | KINGSBURY COLONY INC | | | SCAC4 |
| 23 | KYCL | KYC LINES (USA) INC COMPTON CA | | | SCAC3 |
| 24 | KYCP | K Y C TRUCKING CORP | | | SCAC4 |
| 25 | KYCR | KEY CARRIERS | | | SCAC3 |
| 26 | KYCR | KOYO LINE LTD | | | SCAC4 |
| 27 | KYCS | KENTUCKY CONTAINER SERVICE INC | | | SCAC3 |
| 28 | KYCT | KEY CITY TRANSPORT INC | | | SCAC4 |
| 29 | KYCX | Kirby Refining Corp. | added 7/1954; 7/1954; eliminated 7/1956 | | NAKINA |
| 30 | KYCX | Kirby Chemical Co., Inc. | added 7/1953; eliminated 7/1954 | | NAKINA |
| 31 | KYCX | Kirby Refining Co. | eliminated 7/56 | | NRHS |
| 32 | KYCX | KIRBY REFINING CORP. [KIRBY CHEMICAL CO., INC. | | | PWRC |
| 33 | KYD | Sky Messaging (Pty) Ltd | Callsign: Skyad, | ZA | AVCODES |
| 34 | KYDB | K YAMADA DISTRIBUTORS | | | SCAC4 |
| 35 | KYE | Sky Lease I, Inc. t/a Sky Lease Cargo | IATA: GG, Callsign: Sky Cube, IATA Prefix: 576, Name changed from Tradewinds Airlines, Inc. ICAO designator changed from TDX. | USA | AVCODES |
| 36 | KYEI | KENTUCKY EXPRESS INC | | | SCAC3 |
| 37 | KYEI | KYOEI KAIUN KAISHA LTD | | | SCAC4 |
| 38 | KYEL | KY EXPRESS LLC | | | SCAC4 |
| 39 | KYEN | KRYSTALL ENTERPRISES INC | | | SCAC4 |
| 40 | KYEP | KEYSER ENTERPRISES INC | | | SCAC3 |
| 41 | KYER | KAYCO EXPRESS | | | SCAC4 |
| 42 | KYFF | KYFI INCORPORATED | | | SCAC3 |
| 43 | KYFI | KYFI INCORPORATED | | | SCAC3 |
| 44 | KYFL | KEY FUEL SERVICES INC | | | SCAC4 |
| 45 | KYFM | KELLEY FARMS | | | SCAC4 |
| 46 | KYGA | KELLEY GROUND-AIR EXPEDITE LLC | | | SCAC4 |
| 47 | KYIL | KELLY INTERNATIONAL | | | SCAC3 |
| 48 | KYIL | KIVA ENERGY INC | | | SCAC4 |
| 49 | KYIN | KEY INTERNATIONAL SHIPPING | | | SCAC4 |
| 50 | KYIS | KEYSTONE INTERMODAL SERVICES INC | | | SCAC4 |
| 51 | KYJ | Kumla - Yxhults Järnväg | 1883 - 1983 | S | svenska-lok.se |
| 52 | KYJJ | KLYNOYK, JOHAN | | | SCAC4 |
| 53 | KYKK | KYOTO KAGAKU CO LTD | | | SCAC4 |
| 54 | KYKL | KYKLADES MARITIME CORPORATION | | | SCAC4 |
| 55 | KYKY | KYOKUYO COMPANY LTD | | | SCAC3 |
| 56 | KYKY | KYOKUYO COMPANY LTD | | | SCAC4 |
| 57 | KYL | Kyrgyz International Airlines | IATA: N5, Callsign: Kyrmal, IATA Prefix: 987, ICAO designator changed from KRS | KS | AVCODES |
| 58 | KYLA | KENTUCKY-LOS ANGELES EXPRESS INC | | | SCAC3 |
| 59 | KYLC | KYLE TRUCKING INC | | | SCAC4 |
| 60 | KYLE | Kyle R.R. Co. | added 4/1982; added 1/1986; 1/1994-7/2005 | | NAKINA |
| 61 | KYLE | Kyle R.R. Co. | added 4/82; added 1/86; 1/94-7/2000 | | NRHS |
| 62 | KYLE | KYLE RAILROAD | | | PWRC |
| 63 | KYLE | Kyle Railroad | | | RSRV |
| 64 | KYLE | KYLE RAILROAD COMPANY | | | SCAC3 |
| 65 | KYLE | KYLE RAILROAD COMPANY | | | SCAC4 |
| 66 | KYLE | Kyle R.R. Co. | | USA | TRAFFIC |
| 67 | KYLO | KYLLO TRUCKING INC | | | SCAC4 |
| 68 | KYLP | KYLE TRANSPORT | | | SCAC3 |
| 69 | KYLQ | KENNEDY LOGISTICS | | | SCAC4 |
| 70 | KYLT | KELLY TRANSPORTATION INC | | | SCAC3 |
| 71 | KYLT | KEY LOGISTICS | | | SCAC4 |
| 72 | KYLU | N.Y.K. LINE | | | PWRC |
| 73 | KYLU | NYK Line | | | RSRV |
| 74 | KYM | KRYM, Limited Partnership International Airline | Callsign: Crimea Air, Ceased operations. Name changed from Crimea Air. ICAO designator changed from CRF | UA | AVCODES |
| 75 | KYM | Krym | | | ICAO1 |
| 76 | KYMC | KWANGYANG MARINE CO LTD | | | SCAC4 |
| 77 | KYMI | KYMS SOLUTIONS INC | | | SCAC3 |
| 78 | KYMO | KYMO MARITIME CORPORATION | | | SCAC3 |
| 79 | KYMT | KYM & ALEXXA LOGISTICS INC | | | SCAC4 |
| 80 | KYMY | KY MAY INC | | | SCAC4 |
| 81 | KYN | Kyrnair | IATA: V4, Callsign: Goldbird, Designator V4* recalled by IATA | F | AVCODES |
| 82 | KYN | Kyrnair | Callsign: Goldbird, Designator V4* recalled by IATA | F | AVCODES |
| 83 | KYNU | KLN ENERGY PTE. LTD | | SGP | BIC |
| 84 | KYNV | KIMBERLY NAVIGATION COMPANY LTD | | | SCAC3 |
| 85 | KYOC | KELLEYS OIL CO INC | | | SCAC4 |
| 86 | KYOK | KYOKUYO SHIPPING CO. LTD. | | | SCAC3 |
| 87 | KYOK | KYOKUYO SHIPPING CO LTD | | | SCAC4 |
| 88 | KYPS | KPS TRANSPORT LLC | | | SCAC4 |
| 89 | KYPT | KEYPOINT CARRIERS LIMITED | | | SCAC4 |
| 90 | KYR | Sky Aeronautical Services, S.A. de C.V. | Callsign: Sky Aeronautical, | MEX | AVCODES |
| 91 | KYR | Sky Aeronautical Services | | | ICAO1 |
| 92 | KYRE | KENNEDY RESIDENCE | | | SCAC4 |
| 93 | KYRP | KLEMYR TRANSPORT | | | SCAC4 |
| 94 | KYRQ | KYTHIRA SHIPPING CORPORATION | | | SCAC3 |
| 95 | KYRX | Progress Rail Services Corp. | added 10/1999; 7/2000-7/2005 | | NAKINA |
| 96 | KYRX | Louisville Scrap Material | added 4/1999; eliminated 10/1999 | | NAKINA |
| 97 | KYRX | Louisville Scrap Material Co., Inc. | added 10/1996; eliminated 4/1999 | | NAKINA |
| 98 | KYRX | Louisville Scrap Material Co., Inc. | added 10/96; eliminated 4/99 | | NRHS |
| 99 | KYRX | Louisville Scrap Material | added 4/99; eliminated 10/99 | | NRHS |
| 100 | KYRX | Progress Rail Services Corp. | added 10/99; 7/2000 | | NRHS |
