| 1 | ROY | Royal Aviation, Inc. | IATA: QN, IATA Prefix: 498, Merged in Canada 3000 | CDN | AVCODES |
| 2 | ROY | Pacific Royale Airways, PT. | Callsign: Paxroy, ICAO designator changed to PRQ. ICAO callsign changed to Skyrider | RI | AVCODES |
| 3 | ROY | Roy Ritter Sky Dive | Callsign: Sky Dive, | IL | AVCODES |
| 4 | ROY | Conifair Aviation | | | ICAO1 |
| 5 | ROY | STE ROY | | FR | VKM |
| 6 | ROYC | ROYAL TRAFFIC | | | SCAC4 |
| 7 | ROYD | ROYAL CREST DISTRIBUTORS INC | | | SCAC3 |
| 8 | ROYE | ROYAL EXPRESS INC | | | SCAC4 |
| 9 | ROYF | ROYAL LOGISTICS INC | | | SCAC4 |
| 10 | ROYG | ROYALE CARTAGE INC | | | SCAC3 |
| 11 | ROYH | Roy Hill Mining | | AUS | TRAFFIC |
| 12 | ROYI | ROYS TRANSFER INC | | | SCAC3 |
| 13 | ROYI | ROYS TRANSFER INC | | | SCAC4 |
| 14 | ROYJ | ROYAL ELECTRIC SUPPLY COMPANY | | | SCAC4 |
| 15 | ROYK | ROY, MARK | | | SCAC4 |
| 16 | ROYL | ROYAL TRANSPORTATION LIMITED | | | SCAC3 |
| 17 | ROYL | ROYAL TRANSPORTATION LIMITED | | | SCAC4 |
| 18 | ROYM | ROYAL MARITIME CORPORATION | | | SCAC4 |
| 19 | ROYN | ROYAL MESSENGER SERVICE | | | SCAC3 |
| 20 | ROYN | ROY, MARTIN TRANSPORT | | | SCAC4 |
| 21 | ROYP | ROYAL TRANSPORT INC | | | SCAC3 |
| 22 | ROYP | ROYAL TRANSPORT INC | | | SCAC4 |
| 23 | ROYQ | ROYAL TRUCKING | | | SCAC4 |
| 24 | ROYR | ROY BROS, INC | | | SCAC3 |
| 25 | ROYR | ROY BROS INC | | | SCAC4 |
| 26 | ROYS | ROYS TRANSFER SERVICE | | | SCAC3 |
| 27 | ROYT | ROYSTER TRUCKING INC | | | SCAC3 |
| 28 | ROYT | ROYSTER TRUCKING INC | | | SCAC4 |
| 29 | ROYU | ROYAL NETHERLANDS | | | PWRC |
| 30 | ROYU | Royal Netherlands | | | RSRV |
| 31 | ROYU | ROYAL NETHERLANDS STEAMSHIP CO | | | SCAC3 |
| 32 | ROYX | Chartrand's Tank Car Service, Inc. | eliminated 1/1991 | | NAKINA |
| 33 | ROYX | TCL, Inc. | added 7/1973; 1/1975-1/1980; eliminated 10/1988 | | NAKINA |
| 34 | ROYX | Chartrand's Tank Car Service, Inc. | eliminated 1/91 | | NRHS |
| 35 | ROYX | TCL, Inc. | added 7/73; 1/75-1/80; eliminated 10/88 | | NRHS |
| 36 | ROYX | *TCL INC. | | | PWRC |
| 37 | ROYX | *CHARTRAND'S TANK CAR SERVICE, INC. | | | PWRC |
| 38 | ROYX | TCL | | | RSRV |
| 39 | ROYY | ROYAL TRANSPORT LTD | | | SCAC4 |
