| 1 | WKT | Wojewodzka Kolumna Transportu Sanitarnego | Callsign: Woktrans, | PL | AVCODES |
| 2 | WKT | Diamond Executive Aviation Ltd. | Callsign: White Knight, Name changed to DEA Aviation Ltd. w.e.f. 22 December 2017. | GB | AVCODES |
| 3 | WKT | DEA Aviation Ltd. | Callsign: White Knight, Name changed from Diamond Executive Aviation Ltd. | GB | AVCODES |
| 4 | WKTB | WILKINS TRUCKING INC | | | SCAC4 |
| 5 | WKTE | WISE, KEITH TRUCK LINES INC | | | SCAC4 |
| 6 | WKTK | WALKER TRUCKING | | | SCAC4 |
| 7 | WKTO | WILKINS, KINDOLL TRUCKING | | | SCAC4 |
| 8 | WKTV | WHEEL KING TRANSHAUL INC | | | SCAC4 |
