| 1 | UNR | Rivne Universal Avia | Callsign: Rivne Universal, Ceased operations | UA | AVCODES |
| 2 | UNR | Rivne Universal Avia | | | ICAO1 |
| 3 | UNRE | UNRAU ENTERPISES INC | | | SCAC4 |
| 4 | UNRG | UNIVERSITY OF REGINA | | | SCAC4 |
| 5 | UNRJ | UNRUH, J TRUCKING INC | | | SCAC4 |
| 6 | UNRL | UNITED RENTALS OF CANADA INC | | | SCAC4 |
| 7 | UNRR | UNIVERSAL REFUSE REMOVAL INC | | | SCAC4 |
| 8 | UNRS | UNIVERSAL TRANSPORT INC | | | SCAC4 |
| 9 | UNRT | UNION RIVER TRANSPORTATION INC | | | SCAC4 |
| 10 | UNRU | UNITAS CONTAINERS LIMITED | | BM | BIC |
| 11 | UNRZ | UNIVERSITY OF NORTH CAROLINA RAILROAD | | | PWRC |
