| 1 | UU | Air Austral | ICAO: REU, Callsign: Reunion, IATA Prefix: 760, Formerly Air Reunion | REU | AVCODES |
| 2 | UU | Air Reunion | ICAO: REU, Callsign: Air Reunion, IATA Prefix: 760, Name changed from Reunion Air Service | REU | AVCODES |
| 3 | UUAX | Up-Up & Away, Inc. | 1/1994 (not listed); added 1/1997; eliminated 4/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 4 | UUAX | Up-Up & Away, Inc. | 1/94; added 1/97; eliminated 4/97; 7/2000 | | NRHS |
| 5 | UUAX | UP-UP & AWAY, INC. | | | PWRC |
| 6 | UUAX | Up-Up and Away | | | RSRV |
| 7 | UUAX | UP-UP & AWAY, INC. | | | SCAC4 |
| 8 | UUIC | UNICAR USA INC | | | SCAC4 |
| 9 | UUSA | UNIVAR USA INC | | | SCAC4 |
| 10 | UUUU | ELBTAINER GMBH | | D | BIC |
| 11 | UUUU | UITERWYK CORPORATION | | | SCAC4 |
| 12 | UUUZ | UITERWYK CORP. | | | PWRC |
| 13 | UUUZ | Uiterwyk Corporation | | | RSRV |
| 14 | UUUZ | UITERWYK CORP. | | | SCAC4 |
