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American Airlines
| 20 Compagnies | Compagnie (100) | Nb | Co | Nation | Notes |
| UAT | UAT | 33 | 0 | France | Fusionné |
| Uganda Airlines | Uganda Airlines | 6 | 2 | Ouganda | |
| UIA | UIA | 11 | 0 | Ukraine | Guerre |
| Ukraine Inter. Airlines | Ukraine Inter. Airlines | 42 | 2 | Ukraine | Faillite |
| ULS Airlines Cargo | ULS Airlines Cargo | 5 | 0 | Turquie (Kusu) | |
| Ultimate Jet | Ultimate Jet | 7 | 0 | USA | Bilan |
| Ultra Air | Ultra Air | 6 | 0 | Colombie | Fermé |
| UNHAS | UNHAS | 90 | 0 | USA (ONU) | Humanitaire |
| Uni Air | Uni Air | 16 | 0 | Taïwan | Fusionné |
| United Airlines ( Attentat 2011) | United Airlines | 1103 | 0 | USA | |
| United Overseas Airlines | United Overseas Airlines | 1 | 0 | USA | Film * |
| Universal Airlines | Universal Airlines | 81 | 0 | USA | Faillite |
| Universal Airlines | Universal Airlines | 1 | 0 | Ghana | Faillite |
| Up by El Al | Up by El Al | 5 | 0 | Israël | Fermé |
| UPS Airlines | UPS Airlines | 295 | 22 | USA | Cargo |
| Urumqi Air | Urumqi Air | 16 | 7 | Chine | |
| US Airways | Us Airways | 344 | 61 | USA | |
| US-Bangla_Airlines | US-Bangla_Airlines | 22 | 8 | Bangladesh | |
| UTair | UTair | 61 | 39 | Russie | |
| UTair Express | UTair Express | 28 | 0 | Russie | Fermé |
* Clan des Siciliens
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