| 1 | KZ | Nippon Cargo Airlines | ICAO: NCA, Callsign: Nippon Cargo, IATA Prefix: 933, IATA designator changed from MC | J | AVCODES |
| 2 | KZ | Linea Aerea De Servicio Ejecutivo Regional, C.A. | ICAO: LER, Callsign: Laser, IATA designator changed to 8Z* | YV | AVCODES |
| 3 | KZ | Avair | | IRL | AVCODES |
| 4 | KZ | Pomair | | B | AVCODES |
| 5 | KZ | Trans Europe Air | | F | AVCODES |
| 6 | KZ | Kosovo Railway | Kosovo | | TRAFFIC |
| 7 | KZA | Kazakhstan Airlines | IATA: K4, | KZ | AVCODES |
| 8 | KZA | Kazakhstan Airlines (Kazair) | Callsign: Kazair, | KZ | AVCODES |
| 9 | KZA | Kurzemes Avio Ltd | | RUS | AVCODES |
| 10 | KZA | Kurzemes Avio | | | ICAO1 |
| 11 | KZAQ | KATZA TRUCK | | | SCAC3 |
| 12 | KZC | KŽC Doprava | | CZ | TRAFFIC |
| 13 | KZC | KŽC Doprava s.r.o. | | CZ | VKM |
| 14 | KZCT | KOZCO TRUCKING LTD | | | SCAC4 |
| 15 | KZCU | KOREA ZINC COMPANY LTD | | | SCAC4 |
| 16 | KZD | China Railways | Real: KZD | PRC | TRAFFIC |
| 17 | KZD | Chinese Railways (KЖД) | | CN | VKM |
| 18 | KZE | Euro-Asia Air International | Callsign: Kazeur, | KZ | AVCODES |
| 19 | KZE | Euro-Asia Air International | | | ICAO1 |
| 20 | KZEM | Karlsdorfer Zement GmbH | | DDR | TRAFFIC |
| 21 | KZEU | KTZ EXPRESS JSC | | KZ | BIC |
| 22 | KZFM | KUZMESKUS, F M INC | | | SCAC3 |
| 23 | KZH | Zhezkawan-Air (Zhez Air) | Callsign: Ulutau, | KZ | AVCODES |
| 24 | KZH | Zhez Air | | | ICAO1 |
| 25 | KZH | Chemins de fer du Kazachstan (KЗХ) | | KZ | VKM |
| 26 | KZK | Air Kazakstan | IATA: 9Y, Callsign: Air Kazakstan, IATA Prefix: 452, Founded and commenced operations in 1996. Ceased operations on 29 February 2004. | KZ | AVCODES |
| 27 | KZK | Komunalny Zakład Komunikacyjny Białystok | City: Białystok | PL | TRAFFIC |
| 28 | KZM | Phoebus Apollo Zambia | Callsign: Carzam, | Z | AVCODES |
| 29 | KZM | Phoebus Apolloa Zambia | | | ICAO1 |
| 30 | KZMS | KREITZ, MORRIS & SONS INC | | | SCAC3 |
| 31 | KZN | Aviaservice LLC | Callsign: Kazanair, | RUS | AVCODES |
| 32 | KZNT | KRUZ N TRANSPORT INC | | | SCAC4 |
| 33 | KZR | Air Astana | IATA: 4L, Callsign: Astanaline, IATA designator changed to KC w.e.f 29 October 2006. ICAO designator changed from AST. IATA Designator changed from LQ* | KZ | AVCODES |
| 34 | KZR | Air Astana | IATA: KC, Callsign: Astanaline, IATA Prefix: 465, IATA designator changed from 4L w.e.f. 29 October 2006. ICAO designator changed from AST. IATA Designator changed from LQ* | KZ | AVCODES |
| 35 | KZR | Air Astana | IATA: KC | | ICAO1 |
| 36 | KZR | Air Astana | Real: KC / KZR | KZ | TRAFFIC |
| 37 | KZS | Kazaviaspas | IATA: ZS, Callsign: Spakaz, Founded in 2003. Designator ZS recalled by IATA. | KZ | AVCODES |
| 38 | KZS | Kazaviaspas | | | ICAO1 |
| 39 | KZSC | KASTELORIZO SHIPPING CORPORATION | | | SCAC3 |
| 40 | KZSU | KAZRAIL SERVICE LTD | | | SCAC4 |
| 41 | KZTA | KEZMAN TRUCKING AGENCY INC | | | SCAC3 |
| 42 | KZTB | KRETZ TRUCK BROKERAGE LLC | | | SCAC4 |
| 43 | KZTI | KZ TRUCKING INC | | | SCAC4 |
| 44 | KZU | Kuzu Airlines Cargo Transport | IATA: GO, IATA Prefix: 444, Name changed to ULS Airlines Cargo on 03 July 2009. Name changed from Baron Hava Yolu Kargo Tasimaciligi AS | TR | AVCODES |
| 45 | KZU | ULS Havayollair Kargo Tasimacilik A.S. | IATA: GO, IATA Prefix: 444, Name changed from Kuzu Airlines Cargo Transport on 03 July 2009. Name changed from Baron Hava Yolu Kargo Tasimaciligi AS | TR | AVCODES |
| 46 | KZU | Kuzu Airlines Cargo | IATA: GO | | ICAO1 |
| 47 | KZUS | KRONOZ US | | | SCAC4 |
| 48 | KZW | Khalifa Airways | IATA: K6, Callsign: Khalifa Air, IATA Prefix: 122, Suspended operations on 04 April 2003. | DZ | AVCODES |
| 49 | KZW | Khalifa Airways | | | ICAO1 |
| 50 | KZYC | KALAMAZOO YELLOW CAB | | | SCAC3 |
