| 1 | RLM | Royal American Airways | Callsign: Royal American, | USA | AVCODES |
| 2 | RLM | Royal American Airways | | | ICAO1 |
| 3 | RLM | REGENCY LIMOUSINE INC | | | SCAC4 |
| 4 | RLMA | RAIL MASTERS INC | | | SCAC3 |
| 5 | RLMC | RLM ENTERPRISES | | | SCAC4 |
| 6 | RLMD | REALM INDUSTRIES CORP | | | SCAC4 |
| 7 | RLMG | RILEY MANUFACTURING | | | SCAC4 |
| 8 | RLMI | REALM INC | | | SCAC4 |
| 9 | RLMO | RED LINE MOVING CO INC | | | SCAC3 |
| 10 | RLMQ | REEL TIME TACTICAL LOGISTICS LLC | | | SCAC4 |
| 11 | RLMS | RELIABLE MOVING & STORAGE INC | | | SCAC3 |
| 12 | RLMS | RAILSIDE LOCOMOTIVE SERVICES | | | SCAC4 |
| 13 | RLMT | RELIANCE MARINE TRANSPORTATION AND | | | SCAC3 |
| 14 | RLMX | The David J. Joseph Co. | added 10/2003; 7/2005; eliminated 1/2009 | | NAKINA |
| 15 | RLMX | Joseph Transportation Inc. | added 4/2000; 7/2000; eliminated 10/2003 | | NAKINA |
| 16 | RLMX | The David J. Joseph Co. | added 1/1990; 1/1994; eliminated 4/2000 | | NAKINA |
| 17 | RLMX | The David J. Joseph Co. | added 1/90; 1/94; eliminated 4/2000 | | NRHS |
| 18 | RLMX | Joseph Transportation Inc. | added 4/2000; 7/2000 | | NRHS |
| 19 | RLMX | DAVID J. JOSEPH COMPANY (JOSEPH TRANSPORTATION INC.) | | | PWRC |
| 20 | RLMX | Joseph Transportation | | | RSRV |
