| 1 | RAH | Regent Air | Callsign: Regent, | CDN | AVCODES |
| 2 | RAH | Region Aero, LLC | | RUS | AVCODES |
| 3 | RAH | Regent Air | | | ICAO1 |
| 4 | RAHA | R A H TRANSPORTATION CORP | | | SCAC3 |
| 5 | RAHK | RAWLINS, HILTON K | | | SCAC3 |
| 6 | RAHM | RAPPAHANNOCK MOTOR LINES INC | | | SCAC3 |
| 7 | RAHN | RAHN TRUCKING INC | | | SCAC4 |
| 8 | RAHP | R A H TRANSPORT | | | SCAC3 |
| 9 | RAHQ | RANGER HOT SHOT SERVICES INC | | | SCAC3 |
| 10 | RAHR | RAHIER TRUCKING, INC | | | SCAC3 |
| 11 | RAHR | RAHIER TRUCKING | | | SCAC4 |
| 12 | RAHS | RALPHS TRANSFER CO INC | | | SCAC3 |
| 13 | RAHV | RABOUIN, HENRY V | | | SCAC3 |
| 14 | RAHX | Rohm and Haas Co. | 7/1937-1/1975; eliminated 7/1978; added 4/1990; 1/1994; added 7/1994; 7/2000; eliminated 4/2004; 7/2005 (not listed) | | NAKINA |
| 15 | RAHX | Rohm and Haas Co. | 4/38-1/75; eliminated 7/78; added 4/90; 1/94; added 7/94; 7/2000 | | NRHS |
| 16 | RAHX | ROHM & HAAS COMPANY | | | PWRC |
| 17 | RAHX | Rohm and Haas | | | RSRV |
| 18 | RAHX | ROHM & HAAS CO | | | SCAC3 |
| 19 | RAHX | ROHM & HAAS COMPANY | | | SCAC4 |
