| 1 | RLH | Ruili Airlines Co., Ltd. | IATA: DR, Callsign: Sendi, Name changed to Sunan Ruili Airlines Co., Ltd. On 18 October 2021. | PRC | AVCODES |
| 2 | RLH | Sunan Ruili Airlines Co., Ltd. | IATA: DR, Callsign: Sendi, Name changed from Ruili Airlines Co., Ltd. On 18 October 2021. | PRC | AVCODES |
| 3 | RLHD | R L & H DISTRIBUTING CO INC | | | SCAC3 |
| 4 | RLHH | RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | added 7/1998; 7/2000; eliminated 1/2004; 7/2005 | | NAKINA |
| 5 | RLHH | RaiLink Canada Ltd, d/b/a RaiLink Southern Ontario | added 7/98; 7/2000 | | NRHS |
| 6 | RLHH | RAILINK CANADA LIMITED d/b/a RAILINK SOUTHERN ONTARIO | | | PWRC |
| 7 | RLHH | Southern Ontario Railway (Genesee & Wyoming) | | | RSRV |
| 8 | RLHI | RLH TRUCKING INC | | | SCAC4 |
| 9 | RLHL | ROLLING HILLS TRUCKING | | | SCAC3 |
| 10 | RLHQ | RAIL HIGHWAY SERVICES INC | | | SCAC3 |
| 11 | RLHS | R & L HYDRAULIC SERVICE | | | SCAC3 |
| 12 | RLHT | RAIL HEAD TRANSFER INC | | | SCAC3 |
| 13 | RLHY | RED LINE HEAVY HAUL | | | SCAC4 |
