| Abbreviation | Definition |
|---|---|
| UIO | Mariscal Sucre Airport, Quito, Ecuador |
| UIP | Quimper, France |
| UIQ | Quine Hill, Vanuatu |
| UIR | Quirindi, New South Wales, Australia |
| UIT | Jaluit Island, Marshall Islands |
| UITT | Ust-Kut, Russia |
| UIUH | Khorinsk, Russia |
| UIUU | Ulan Ude-Mukhino, Russia |
| UIZ | Berz Macomb Airport, Macomb, Michigan USA (closed permanently, August 2, 2003) |
| UJE | Ujae Island, Marshall Islands |
| UKA | Ukunda, Kenya |
| UKB | Kobe, Japan |
| UKBB | Kiev Borispol, Ukraine |
| UKCC | Donetsk, Ukraine |
| UKCW | Luhansk, Ukraine |
| UKDD | Dnipropetrovs'k, Ukraine |
| UKDE | Zaporizhzhia, Ukraine |
| UKDR | Kryvyi Rih, Ukraine |
| UKFB | Sevastopol (Belbek), Ukraine |
| UKFF | Simferopol, Ukraine |