| 1 | RUK | Ryanair UK Limited | IATA: RK, Callsign: Blue Max, | GB | AVCODES |
| 2 | RüKB | Rügensche Kleinbahn GmbH & Co | Putbus | D | privat-bahn.de |
| 3 | RUKB | | | D | TRAFFIC |
| 4 | RUKB | Rügensche Kleinbahn GmbH | | DE | VKM |
| 5 | RUKC | RUGGIERO TRUCKING CO INC | | | SCAC4 |
| 6 | RUKM | RUCKER MOVING & STORAGE COMPANY | | | SCAC3 |
| 7 | RUKN | RUCKMAN, ROBERT | | | SCAC3 |
| 8 | RUKN | RUKAJ, NIKOLA GALLERY | | | SCAC4 |
| 9 | RUKO | RUKO PRODUCTS INC | | | SCAC4 |
| 10 | RUKR | RUCKER TRUCKING & LEASING INC | | | SCAC3 |
| 11 | RUKS | ROSE, MICK TRUCKING | | | SCAC4 |
| 12 | RUKT | RUKERT TERMINALS CORP | | | SCAC3 |
| 13 | RUKT | RUKERT TERMINALS CORP | | | SCAC4 |
