| 1 | ECS | Executive Aircraft Charter And Charter Services Ltd. | Callsign: Echo, | IRL | AVCODES |
| 2 | ECS | Air Ecosse | IATA: WG, Callsign: Air Ecosse, | GB | AVCODES |
| 3 | ECS | Air Ecosse Ltd | IATA: SM, Callsign: Ecosse Air, Founded in 1977 | GB | AVCODES |
| 4 | ECS | Executive Aircraft Charter and Charter Services | | | ICAO1 |
| 5 | ECS | EUROVIA CS, a. s. | | CZ | VKM |
| 6 | ECSA | EASTMED COMPANY S A | | | SCAC4 |
| 7 | ECSC | EXPRESS CARGO SERVICE COMPANY LTD | | | SCAC3 |
| 8 | ECSC | EC SERVICE EXPRESS INC | | | SCAC4 |
| 9 | ECSD | EAST COAST DISTRIBUTION SERVICE INC | | | SCAC3 |
| 10 | ECSE | ECLIPSE MARITIME INC. | | | SCAC3 |
| 11 | ECSF | EAST COAST SPECIALIZED HAULING LLC | | | SCAC4 |
| 12 | ECSG | ENVIRONMENTAL CROSSINGS INC | | | SCAC4 |
| 13 | ECSJ | EASTCOAST CONTAINER SERVICES CORP | | | SCAC4 |
| 14 | ECSK | EAST COAST SKIPPERS | | | SCAC3 |
| 15 | ECSK | ENTOURAGE CONTRACTING SERVICES INC | | | SCAC4 |
| 16 | ECSL | EASTERN C SHIPPING LTD | | | SCAC3 |
| 17 | ECSL | EASTERN C SHIPPING LTD | | | SCAC4 |
| 18 | ECSM | ENCORE SALES LTD | | | SCAC4 |
| 19 | ECSN | ECOSHIP SENDIRIAN BERHAD | | | SCAC4 |
| 20 | ECSO | ELGIN CAR SHOPS | | | SCAC4 |
| 21 | ECSP | EXPRESS CONSOLIDATION SYSTEMS CORP | | | SCAC4 |
| 22 | ECSR | EAST COAST STARTER DRIVE | | | SCAC3 |
| 23 | ECSS | E C SERVICES | | | SCAC4 |
| 24 | ECST | ECS TRUCKING | | | SCAC3 |
| 25 | ECSU | BALTICON S.A. | | PL | BIC |
| 26 | ECSU | LLC EURO-ASIAN CONTAINER SERVICE | | | SCAC4 |
| 27 | ECSX | General American Transportation Corp. | 1/1952; eliminated 10/1953 | | NAKINA |
| 28 | ECSX | Scurlock Tank Car Co. | 1/1950 | | NAKINA |
| 29 | ECSX | General American Transportation Corp. | 1/52; eliminated 10/53 | | NRHS |
| 30 | ECSX | *SCURLOCK TANK CAR CO. | | | PWRC |
| 31 | ECSX | *GENERAL AMERICAN TRANSPORTATION CORP | | | PWRC |
| 32 | ECSY | ECONOMY COATING SYSTEMS | | | SCAC4 |
| 33 | ECSZ | ELGIN CROP SERVICE COMPANY, INC. | | | PWRC |
