| 1 | ECO | Aero Sierra Eco, S.A. de C.V. | Callsign: Aeroeco, | MEX | AVCODES |
| 2 | ECO | {`Eastern Australian Airlines (East Coast (Commuter) Airlines Ltd.`};ZIPCODE= | IATA: TN, Subsidiary of Qantas | AUS | AVCODES |
| 3 | ECO | Linea Aerea Eco Jet S.A. | IATA: 8J, | BOL | AVCODES |
| 4 | ECO | ECORAIL Inc. | 7/2000-7/2005 | | NAKINA |
| 5 | ECO | ECORAIL Inc. | Jul-00 | | NRHS |
| 6 | ECO | ECORAIL INCORPORATED | | | PWRC |
| 7 | ECO | Ecorail | | | RSRV |
| 8 | ECO | Eco Rail | | FAN | TRAFFIC |
| 9 | ECOC | ECONOMY HOUSING COMPANY INC | | | SCAC3 |
| 10 | ECOD | ECONO DELIVERY | | | SCAC3 |
| 11 | ECOD | ECO MOVING & STORAGE INC | | | SCAC4 |
| 12 | ECOD | ECODIESEL S.A. | | RO | VKM |
| 13 | ECOE | ECONEXPRESS INC | | | SCAC3 |
| 14 | ECOF | ECOFF TRUCKING INC | | | SCAC3 |
| 15 | ECOG | ECOGRANULE | | | SCAC4 |
| 16 | ECOI | ECO INC | | | SCAC3 |
| 17 | ECOI | ECO INC | | | SCAC4 |
| 18 | ECOJ | ELBURN COOP | | | SCAC4 |
| 19 | ECOL | Ecolines | | LV | TRAFFIC |
| 20 | ECOM | ECONOMY COAL CO | | | SCAC3 |
| 21 | ECOM | ELANN.COM INC | | | SCAC4 |
| 22 | ECON | EASTERN CONTAINER LIMITED | | | PWRC |
| 23 | ECON | ECONOLINE TRANSPORT LTD | | | SCAC3 |
| 24 | ECOO | ECONO OIL COMPANY | | | SCAC4 |
| 25 | ECOP | E-CON PARCEL EXPRESS INC | | | SCAC3 |
| 26 | ECOQ | ECONOMY TRANSPORT INC | | | SCAC3 |
| 27 | ECOQ | ECO TRUCKING INC | | | SCAC4 |
| 28 | ECOR | ENCORE TRUCKING INC | | | SCAC3 |
| 29 | ECOS | EAST COAST CARTAGE INC | | | SCAC3 |
| 30 | ECOS | ECO TRANSPORTES INTERNACIONALES S A | | | SCAC4 |
| 31 | ECOSA | Energetyka Cieplna Opolszczyzny S.A. | | PL | VKM |
| 32 | ECOT | ECHO TRUCKING COMPANY | | | SCAC3 |
| 33 | ECOT | ECHO TRUCKING COMPANY | | | SCAC4 |
| 34 | ECOU | ECO.GE.M.M.A | | I | BIC |
| 35 | ECOU | ECOS LTD | | | SCAC4 |
| 36 | ECOV | ECONOMY MOVING & STORAGE COMPANY | | | SCAC3 |
| 37 | ECOW | ECOWASTE TRANSPORT INC | | | SCAC3 |
| 38 | ECOW | ECOWAY LLC | | | SCAC4 |
| 39 | ECOX | Eco East | 1/1994 (not listed); added 1/1997; eliminated 4/1997; 7/2000-7/2005 (not listed) | | NAKINA |
| 40 | ECOX | Eagle Cotton Oil Co. | 7/1935-10/1966; eliminated 10/1968 | | NAKINA |
| 41 | ECOX | Eagle Cotton Oil Co. | 4/38-10/66; eliminated 10/68 | | NRHS |
| 42 | ECOX | Eco East | 1/94; added 1/97; eliminated 4/97; 7/2000 | | NRHS |
| 43 | ECOX | *EAGLE COTTON OIL CO. | | | PWRC |
| 44 | ECOX | +ECO EAST | | | PWRC |
| 45 | ECOX | Eco East | | | RSRV |
| 46 | ECOX | EAGLE COTTON OIL CO | | | SCAC3 |
| 47 | ECOX | ECO EAST | | | SCAC4 |
| 48 | ECOZ | ECORAIL INCORPORATED (ECOLAB) | | | PWRC |
| 49 | ECOZ | Ecorail | | | RSRV |
