| 1 | MDC | Atlantic Aero, Inc. d/b/a Atlantic Aero And Mid-Atlantic Freight | Callsign: Night Ship, | USA | AVCODES |
| 2 | MDC | Atlantic Aero and Mid-Atlantic Freight | | | ICAO1 |
| 3 | MDCC | MID-COLUMBIA CHARTERS INC | | | SCAC4 |
| 4 | MDCH | MERRITT, DONALD C | | | SCAC4 |
| 5 | MDCL | MACDONALD CARTAGE LTD | | | SCAC4 |
| 6 | MDCN | MID CONTINENT TRUCKING COMPANY | | | SCAC4 |
| 7 | MDCO | MID-ATLANTIC LEASING CORP | | | SCAC4 |
| 8 | MDCR | MIDLAND TERMINAL COMPANY | | | PWRC |
| 9 | MDCR | MIDLAND COURIER SERVICES, INC | | | SCAC1 |
| 10 | MDCU | MEDLOG (SHANGHAI) CO.,LTD. | | PRC | BIC |
| 11 | MDCW | MID-CONTINENT COAL AND COKE | | | SCAC4 |
| 12 | MDCX | Mexicana de Cobre, S.A. de C.V. | added 7/1989; 1/1994-7/2005; eliminated 1/2006 | | NAKINA |
| 13 | MDCX | Middleboro Chemical Industries, Inc. | 4/1970; added 7/1971; eliminated 1/1972 | | NAKINA |
| 14 | MDCX | Middleboro Chemical Industries, Inc. | 4/70; eliminated 1/72 | | NRHS |
| 15 | MDCX | Mexicana de Cobre, S.A. de C.V. | added 7/89; 1/94-7/2000 | | NRHS |
| 16 | MDCX | *MIDDLEBORO CHEMICAL INDUSTRIES, INC. | | | PWRC |
| 17 | MDCX | +MEXICANA DE COBRE SA DE CV [MEXICANA DE ACIDO SULFURICO, SA DE CV] | | | PWRC |
| 18 | MDCX | Mexicana De Cobre de CV | | | RSRV |
| 19 | MDCX | MEXICANA DE COBRE SA DE CV | | | SCAC4 |
