| 1 | RGI | Regional Airlines | IATA: VM, Callsign: Regional Airlines, IATA Prefix: 982, Merged into Regional Compagnie Aerienne Europeene | F | AVCODES |
| 2 | RGIC | RIGGS, INC | | | SCAC3 |
| 3 | RGID | RODRIGUEZ GARZA, IDALIA | | | SCAC4 |
| 4 | RGIE | REGIONAL IMPORT AND EXPORT TRUCKING | | | SCAC3 |
| 5 | RGIF | R & G INTERFREIGHT | | | SCAC4 |
| 6 | RGIG | ROLLING ACRES DAIRY | | | SCAC4 |
| 7 | RGIL | REGIONAL TRANSFER CO | | | SCAC3 |
| 8 | RGIN | REGIONAL INTERNATIONAL SERVICES | | | SCAC3 |
| 9 | RGIN | R G INTERNATIONAL | | | SCAC4 |
| 10 | RGIO | RIGGI OIL COMPANY INC | | | SCAC4 |
| 11 | RGIQ | R G TRUCKING | | | SCAC3 |
| 12 | RGIQ | RMD GROUP INC | | | SCAC4 |
| 13 | RGIS | READING INDUSTRIAL SCRAP INC | | | SCAC3 |
| 14 | RGIS | RAGNAR RELOCATION SERVICES | | | SCAC4 |
| 15 | RGIT | RIG-IT TRANSPORTATION | | | SCAC4 |
| 16 | RGIX | Republic Gas and Utilities Corp. | added 10/1974; 1/1975-7/2000; eliminated 4/2001; 7/2005 (not listed) | | NAKINA |
| 17 | RGIX | Republic Gas and Utilities Corp. | added 10/74; 1/75-7/2000; eliminated 4/2001 | | NRHS |
| 18 | RGIX | REPUBLIC GAS & UTILITIES CORP | | | PWRC |
| 19 | RGIX | Republic Gas and Utilities Corporation | | | RSRV |
| 20 | RGIX | REPUBLIC GAS & UTILITIES CORP | | | SCAC4 |
