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Peach Aviation (Japon)
| 12 Compagnies | Compagnie (100) | Nb | Co | Nation | Notes |
| Kenn Borek Air | Kenn Borek Air | 35 | 0 | Canada (Cargo) | Ambulance |
| Kenya Airways | Kenya Airways | 34 | 0 | Kenya | |
| Kenya Flamingo Airways | Kenya Flamingo Airways | 2 | 0 | Kenya | Fermé |
| KF Aerospace | KF Aerospace | 12 | 0 | Canada | |
| Kyrnair | Kyrnair | 5 | 0 | France | Fermé |
| Key Airlines | Key Airlines | 17 | 0 | USA | Faillite |
| Key Lime Air | Key Lime Air | 34 | 0 | USA | Cargo |
| Keyway Air Transport | Keyway Air Transport | 2 | 0 | USA (Cargo) | Fermé |
| Khalifa Airways | Khalifa Airways | 47 | 0 | Algérie | Faillite |
| Kharkiv Airlines | Kharkiv Airlines | 3 | 0 | Ukraine | Fermé |
| Khors Air | Khors Air | ? | 0 | Ukraine | Guerre |
| Khozu Avia | Khozu Avia | 1 | 0 | Kazakhstan |
| 6 Compagnies | Compagnie (100) | Nb | Co | Nation | Notes |
| Kunming Airlines | Kunming Airlines | 30 | 0 | Chine | |
| Kurdistan Airlines | Kurdistan Airlines | 1 | 0 | Irak (Dubaï) | Inactive |
| Kush Air | Kush Air | 2 | 0 | Ouganda | |
| Kuwait Airways | Kuwait Airways | 34 | 19 | Koweit | |
| Kyrgyzstan Airlines (Interdit UE) | Kyrgyzstan Airlines | 20 | 0 | Kirghizistan | Fermé |
| Kyrnair | Kyrnair | 5 | 0 | France | Fermé |