| 1 | ERX | Earth Airlines services Limited | Callsign: Earth Air, | WAN | AVCODES |
| 2 | ERX | Earth Airlines Services | | | ICAO1 |
| 3 | ERX | Canadian Kodiak Refineries Ltd. | added 7/1960; 4/1961; eliminated 7/1961 | | NAKINA |
| 4 | ERX | Excelsior Refineries Ltd. | 1/1950-10/1957; eliminated 7/1960 | | NAKINA |
| 5 | ERX | Emlenton Refining Co. | 8/1920 & 7/1930 | | NAKINA |
| 6 | ERX | Excelsior Refineries Ltd. | 1/52-10/57; eliminated 7/60 | | NRHS |
| 7 | ERX | Canadian Kodiak Refineries Ltd. | added 7/60; 4/61 | | NRHS |
| 8 | ERX | *EMLENTON REFINING CO. | | | PWRC |
| 9 | ERX | *CANADIAN KODIAK REFINERIES LTD. [EXCELSIOR REFINERIES LTD.] | | | PWRC |
| 10 | ERX | EuroRailExpress | | NL | VKM |
| 11 | ERXD | EUROMEX OF GEORGIA INC (TL | | | SCAC4 |
| 12 | ERXE | EMREX INC | | | SCAC4 |
| 13 | ERXI | ERX INC | | | SCAC3 |
| 14 | ERXI | EUROMEX OF GEORGIA INC | | | SCAC4 |
