| 1 | ECX | Ecomex Air Cargo, Lda. | Callsign: Air Ecomex, | ANG | AVCODES |
| 2 | ECX | Ecomex Air Cargo | | | ICAO1 |
| 3 | ECX | Constantin Refining Co. | 8/1920-7/1923 | | NAKINA |
| 4 | ECX | Emeryville Chemical Co. | 7/1935-7/1954 | | NAKINA |
| 5 | ECX | Emeryville Chemical Co. | 4/38-1/52 | | NRHS |
| 6 | ECX | *CONSTANTIN REFINING CO. | | | PWRC |
| 7 | ECX | *EMERYVILLE CHEMICAL CO. | | | PWRC |
| 8 | ECXE | EVANS DELIVERY COMPANY INC (DIVISIO | | | SCAC4 |
| 9 | ECXJ | ECOEXPRES | | | SCAC4 |
| 10 | ECXN | ELLICOTT TRANSPORT INC | | | SCAC4 |
| 11 | ECXP | EAST COAST EXPRESS | | | SCAC4 |
| 12 | ECXQ | ECO TRANSPORTATION INC | | | SCAC4 |
| 13 | ECXS | EURO CARGO EXPRESS INC | | | SCAC4 |
| 14 | ECXT | E C TRANSPORTATION | | | SCAC4 |
| 15 | ECXW | ECO TRANSPORT | | | SCAC4 |
| 16 | ECXX | East Carbon Development Co. | added 10/2006 | | NAKINA |
| 17 | ECXX | ECDC Environmental, L.C. | added 1/1995; 7/2000-7/2005; eliminated 10/2006 | | NAKINA |
| 18 | ECXX | East Carbon Development Co. | 1/1994 (not listed) | | NAKINA |
| 19 | ECXX | East Carbon Development Co. | Jan-94 | | NRHS |
| 20 | ECXX | ECDC Environmental, L.C. | added 1/95; 7/2000 | | NRHS |
| 21 | ECXX | EAST CARBON DEVELOPMENT COMPANY (ECDC ENVIRONMENTAL, LC) | | | PWRC |
| 22 | ECXX | ECDC Environmental | | | RSRV |
| 23 | ECXX | EAST CARBON DEVELOPMENT COMPANY | | | SCAC4 |
| 24 | ECXX | East Carbon Development Co. | | USA | TRAFFIC |
