Airlines
| Airline Name | Country | IATA Code | ICAO | AWB Prefix |
|---|---|---|---|---|
| Uni-Top Airlines | China | UW | ||
| Uralaviali | Russia | URL | ||
| Uralinteravia | Russia | U3 | URA | 713 |
| UTair Aviation | Russia | UT | UTA | 298 |
| Ukhta Airenterprise | Russia | UKH | ||
| Ulyanovsk Civil Aviation Flight School | Russia | UHS | ||
| Ural Air | Russia | URW | ||
| Ural Airlines | Russia | U6 | SVR | 262 |
| United Arabian Airlines | Sudan | UAB | ||
| UNI Air | Taiwan | B7 | UIA | 525 |
| ULS Airlines Cargo | Turkey | GO | KZU | 444 |
| Unsped Cargo Airlines | Turkey | UNS | ||
| Uganda Airlines | Uganda | QU | UGA | 673 |
| Uganda Air Cargo | Uganda | UCC | ||
| UES Avia Aircompany | Ukraine | UES | ||
| Ukraine Air Alliance Airlines | Ukraine | UKL | ||
| Ukraine Air Service | Ukraine | ASG | ||
| Ukraine International Airlines | Ukraine | PS | AUI | 566 |
| Ukrainian Cargo Airways | Ukraine | 6Z | UKS | |
| Ukrainian Helicopters | Ukraine | UHL |