| 1 | UDC | Utility Enterprise DonbassAero Airline | IATA: 7D, Callsign: Aviation donbass, IATA Prefix: 897, Name changed from Aircompany Donbass - Eastern Ukrainian Airlines | UA | AVCODES |
| 2 | UDC | DonbassAero | IATA: 5D | | ICAO1 |
| 3 | UDC | UNION DEPOT COMPANY - COLUMBIA, OHIO | | | PWRC |
| 4 | UDCA | URIBE DURAN, CARLOS | | | SCAC4 |
| 5 | UDCP | UNION DISTRIBUTING COMPANY | | | SCAC4 |
| 6 | UDCS | UNITED ORCHIDS PLUS CORP | | | SCAC4 |
| 7 | UDCT | UNITED DRIVERS CORPORATION INC | | | SCAC4 |
