| 1 | ECG | Aero Ejecutivos R.C.G., S.A. de C.V. | Callsign: Ejecutivis RCG, | MEX | AVCODES |
| 2 | ECG | Aero Ejecutivos RCG | | | ICAO1 |
| 3 | ECGA | ECOLOGY AUTO WRECKING | | | SCAC4 |
| 4 | ECGH | EAST COAST GREYHOUND | | | SCAC3 |
| 5 | ECGI | ECOLOGY CONTROL INC | | | SCAC3 |
| 6 | ECGL | ELGIN CARTAGE LIMITED | | | SCAC3 |
| 7 | ECGL | ECL CARRIERS GP INC | | | SCAC4 |
| 8 | ECGO | EARTH CARGO INC | | | SCAC4 |
| 9 | ECGP | EXPRESS CARGO CORP | | | SCAC4 |
| 10 | ECGS | ELCANO GAS TRANSPORT SA | | | SCAC4 |
| 11 | ECGT | ECOGISTICS | | | SCAC4 |
| 12 | ECGX | Alabama Power Co. | added 1/1991; 1/1994; eliminated 7/1999; added 10/1999; 7/2000-7/2005 | | NAKINA |
| 13 | ECGX | Alabama Power Co. | added 1/91; 1/94; eliminated 7/99; added 10/99; 7/2000 | | NRHS |
| 14 | ECGX | *E. C. GASTON RAILROAD | | | PWRC |
| 15 | ECGX | +ALABAMA POWER COMPANY | | | PWRC |
| 16 | ECGX | Alabama Power | | | RSRV |
| 17 | ECGX | ALABAMA POWER COMPANY | | | SCAC4 |
| 18 | ECGY | ECOLOGY CHEMICAL & REFINING CO | | | SCAC3 |
