| 1 | ELK | Estonian Aviation Company ELK Airways | IATA: S8, Callsign: Elka, IATA Prefix: 520, Designator S8 recalled by IATA | EST | AVCODES |
| 2 | ELK | Estonian Aviation Company ELK Airways | Callsign: Elka, Originally known as Eesti Lennukompanii. Founded in 1991. Ceased operations. Designator S8 recalled by IATA | EST | AVCODES |
| 3 | ELK | Miejski Zakład Komunikacyjny w Ełku | | PL | TRAFFIC |
| 4 | ELK | Eurolokpool GmbH | | DE | VKM |
| 5 | ELKA | ELK TRANSPORT LLC | | | SCAC4 |
| 6 | ELKB | ELNICKI BROTHERS INC | | | SCAC3 |
| 7 | ELKC | ELK TRANSPORTATION CO INC | | | SCAC3 |
| 8 | ELKC | ELKCHESTER TRUCKING CO INC | | | SCAC4 |
| 9 | ELKG | ELK RIDGE EXPRESS | | | SCAC4 |
| 10 | ELKH | ELK HORN ELEVATOR | | | SCAC3 |
| 11 | ELKH | EL TRUCKING | | | SCAC4 |
| 12 | ELKI | ELKINS/AMERICAN INC | | | SCAC3 |
| 13 | ELKK | ELKEM METALS COMPANY | | | PWRC |
| 14 | ELKM | ELKEM METALS CO | | | SCAC3 |
| 15 | ELKN | ELKINS TRANSPORT SERVICE, INC | | | SCAC3 |
| 16 | ELKO | ENEA Wytwarzanie S.A. | | PL | VKM |
| 17 | ELKP | ELK TRANSPORTATION INC. | | | SCAC4 |
| 18 | ELKQ | EMMANUEL TRUCKING | | | SCAC4 |
| 19 | ELKR | Elk River R.R., Inc. | 1/1994-7/2005 | | NAKINA |
| 20 | ELKR | Elk River R.R., Inc. | 1/94-7/2000 | | NRHS |
| 21 | ELKR | ELK RIVER RAILROAD, INC. | | | PWRC |
| 22 | ELKR | Elk River Railroad | | | RSRV |
| 23 | ELKR | ELK RIVER RAILROAD INC | | | SCAC3 |
| 24 | ELKR | ELK RIVER RAILROAD INC | | | SCAC4 |
| 25 | ELKT | ELKTON TRUCKING COMPANY INC | | | SCAC3 |
| 26 | ELKT | ELKOW TRUCKING | | | SCAC4 |
| 27 | ELKU | EURO NORDIC LOGISTICS B.V | | NL | BIC |
| 28 | ELKU | EURO NORDIC LOGISTICS BV | | | SCAC4 |
| 29 | ELKV | ELK VALLEY FREIGHT LINE INC | | | SCAC3 |
| 30 | ELKV | ENLINK GEOENERGY SERVICES INC | | | SCAC4 |
| 31 | ELKX | Elkem Metals Co. | added 1/1982; 1/1994; eliminated 4/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 32 | ELKX | Elkem Metals Co. | added 1/82; 1/94; eliminated 4/97; 7/2000 | | NRHS |
| 33 | ELKX | ELKEM METAL COMPANY | | | PWRC |
| 34 | ELKX | ELkem Metals | | | RSRV |
| 35 | ELKZ | ELK RIVER RAILROAD, INC. | | | PWRC |
