| 1 | RGL | Regional Air Lines | IATA: FN, Callsign: Maroc Regional, IATA Prefix: 259, | MA | AVCODES |
| 2 | RGL | Regionalair | Callsign: Regair, | GB | AVCODES |
| 3 | RGL | Regionair | IATA: JA, Callsign: Regair, Ceased operations in 1990. | GB | AVCODES |
| 4 | RGL | Mountain Crest Farm, LLC | Callsign: Ridgeline, Name changed to Tradecraft Flying Service, LLC. | USA | AVCODES |
| 5 | RGL | Tradecraft Flying Service, LLC | Callsign: Ridgeline, Name changed from Mountain Crest Farm, LLC. | USA | AVCODES |
| 6 | RGL | Regional Air Lines | | | ICAO1 |
| 7 | RGLB | RELIANCE GLOBAL LOGISTICS USA | | | SCAC4 |
| 8 | RGLC | REGAL COACHES | | | SCAC3 |
| 9 | RGLC | RGL EXPRESS | | | SCAC4 |
| 10 | RGLD | RGL DISTRIBUTION CENTER INC | | | SCAC3 |
| 11 | RGLD | RECYCLING GROUP LTD | | | SCAC4 |
| 12 | RGLE | REGIONAL ENTERPRISES INC | | | SCAC3 |
| 13 | RGLF | RTS GROUP LLC | | | SCAC4 |
| 14 | RGLH | RAFFERTY GLOBAL LOGISTICS LLC | | | SCAC4 |
| 15 | RGLJ | ROGERS, L. J., JR., TRUCKING, INC | | | SCAC3 |
| 16 | RGLJ | ROGERS, L J JR TRUCKING INC | | | SCAC4 |
| 17 | RGLK | RIEGEL TRUCKING | | | SCAC4 |
| 18 | RGLL | REG-LEN LEASING INC | | | SCAC3 |
| 19 | RGLM | REGAL LIMOUSINES | | | SCAC3 |
| 20 | RGLO | REGAL TRUCKING CO | | | SCAC3 |
| 21 | RGLP | REGAL TRANSPORT INC | | | SCAC4 |
| 22 | RGLQ | REGAL FREIGHT LINES INC | | | SCAC3 |
| 23 | RGLS | REGAL SERVICES | | | SCAC3 |
| 24 | RGLS | REGAL SERVICES | | | SCAC4 |
| 25 | RGLT | REGAL TRANSPORTS | | | SCAC3 |
| 26 | RGLX | Roberto de la Garza y Hnos, S.A. | eliminated 1/1983 | | NAKINA |
| 27 | RGLX | Roberto de la Garza y Hnos, S.A. | eliminated 1/83 | | NRHS |
| 28 | RGLX | ROBERTO DE LA GARZA Y HNOS, SA | | | PWRC |
