| Abbreviation | Definition |
|---|---|
| UCA | Utica, New York USA |
| UCE | Eunice Airport, Eunice, Louisiana USA |
| UCFM | Bishkek (Manas), Kyrgyzstan |
| UCFO | Osh, Kyrgyzstan |
| UCK | Lutsk, Russia |
| UCN | Buchanan, Liberia |
| UCY | Everett Stewart Airport, Union City, Tennessee USA |
| UDD | Bermuda Dunes Airport, Palm Springs, California |
| UDE | Uden, Netherlands |
| UDG | Darlington County Jetport, Darlington, South Carolina USA |
| UDI | Uberlandia, Minas Gerais, Brazil |
| UDJ | Uzhgorod, Ukraine |
| UDLS | Stepanavan Airport, Armenia |
| UDN | Udine, Italy |
| UDO | Udomxay, Laos |
| UDR | UdaipUr, Indonesia |
| UDSG | Gyumri (Shirak), Armenia |
| UDYE | Erebuni (Yerevan), Armenia |
| UDYZ | Zvartnots, Armenia |
| UEBN | Nizhne-Yansk, Russia |