| 1 | EUK | Air Atlanta Europe Ltd. | IATA: 5A, Callsign: Snowbird, Merged into Excel Airways on 01 May 2006. AOC revoked on 08 November 2006. | GB | AVCODES |
| 2 | EUK | Aer Lingus (U.K.) Limited | IATA: EG, Callsign: Green Flight, Designator EG reinstated by IATA | GB | AVCODES |
| 3 | EUK | Air Atlanta Europe | | | ICAO1 |
| 4 | EUKA | Eureka Southern R.R. Co., Inc. | added 1/1985; eliminated 1/1991; 1/1994 | | NAKINA |
| 5 | EUKA | Eureka Southern R.R. Co., Inc. | added 1/85; eliminated 1/91; 1/94 | | NRHS |
| 6 | EUKA | RETIRED 06-18-92 (368) ATP [EUREKA SOUTHERN RR] | | | PWRC |
| 7 | EUKA | EUREKA SOUTHERN RAILROAD CO INC | | | SCAC3 |
| 8 | EUKF | EUREKA FUEL COMPANY | | | SCAC4 |
| 9 | EUKO | EUKOR CAR CARRIERS | | | SCAC4 |
| 10 | EUKT | EUREKA TERMINALS INC | | | SCAC3 |
