| 1 | MCT | Transportacion Aerea del Mar de Cortes, S.A. de C.V. | Callsign: Trans Cortes, | MEX | AVCODES |
| 2 | MCT | Transportacion Aerea Del Mar De Cortes | | | ICAO1 |
| 3 | MCT | MECHEL CAMPIA TURZII SA | | RO | VKM |
| 4 | MCTA | Minnesota Central R.R. Co. | added 4/1995; eliminated 4/1997; 7/2000-7/2005 | | NAKINA |
| 5 | MCTA | Minnesota Central R.R. Co. | added 4/95; eliminated 4/97; 7/2000 | | NRHS |
| 6 | MCTA | MINNESOTA CENTRAL RAILROAD CO. | | | PWRC |
| 7 | MCTA | Minnesota Central Railroad | | | RSRV |
| 8 | MCTB | M C TRUCKING COMPANY INC | | | SCAC4 |
| 9 | MCTC | MUSEUM CENTER FOR TRANSPORTATION & COMMERCE RAILROAD MUSEUM (GALVESTON TX) | | | PWRC |
| 10 | MCTC | MASTERS CITY TRANSPORT CO INC | | | SCAC4 |
| 11 | MCTJ | MACNEIL, TERRY | | | SCAC4 |
| 12 | MCTK | M C TRUCKING | | | SCAC4 |
| 13 | MCTM | MCT TERMINAL & TRANSPORT INC | | | SCAC4 |
| 14 | MCTN | MITSUBISHI CORPORATION LT USA | | | SCAC4 |
| 15 | MCTP | M C TRANSPORTATION | | | SCAC4 |
| 16 | MCTR | Mackinac Transportation Co. | 1/1975 | | NAKINA |
| 17 | MCTR | Mackinac Transportation Co. | Jan-75 | | NRHS |
| 18 | MCTR | MACKINAC TRANSPORTATION CO. | | | PWRC |
| 19 | MCTR | MCKEE FOODS TRANSPORTATION LLC | | | SCAC4 |
| 20 | MCTS | MACS TRANSPORT SERVICES LTD | | | SCAC4 |
| 21 | MCTS | Milwaukee County Transit System | | USA | TRAFFIC |
| 22 | MCTT | M C T TRANSPORT INC | | | SCAC4 |
| 23 | MCTU | MARIANA EXPRESS LINES PTE LTD | | SGP | BIC |
| 24 | MCTV | MCCAIN TRANSPORT INC | | | SCAC4 |
| 25 | MCTX | Modern Continental Construction Co. Inc. | 7/2000-7/2005 (not listed) | | NAKINA |
| 26 | MCTX | Velsicol Chemical Corp. | added 4/1977; 1/1980; eliminated 7/1982 | | NAKINA |
| 27 | MCTX | Michigan Chemical Corp. | 7/1954-1/1975; eliminated 4/1977 | | NAKINA |
| 28 | MCTX | Matawan Coal Tar Products Corp. | 7/1932 | | NAKINA |
| 29 | MCTX | Michigan Chemical Corp. | 10/57-1/75 | | NRHS |
| 30 | MCTX | Velsicol Chemical Corp. | 1/80; eliminated 7/82 | | NRHS |
| 31 | MCTX | Modern Continental Construction Co. Inc. | Jul-00 | | NRHS |
| 32 | MCTX | *MATAWAN COAL TAR PRODUCTS CORP. | | | PWRC |
| 33 | MCTX | *VELSICOL CHEMICAL CORP. [MICHIGAN CHEMICAL CORP.] | | | PWRC |
| 34 | MCTX | +MODERN CONTINENTAL CONSTRUCTION CO., INC. | | | PWRC |
| 35 | MCTX | Modern Continental Construction | | | RSRV |
| 36 | MCTX | MODERN CONTINENTAL CONSTRUCTION CO | | | SCAC4 |
| 37 | MCTY | MCCORMICKS TRANSPORT SYSTEMS INC | | | SCAC4 |
| 38 | MCTZ | MOUNTAIN CEMENT | | | PWRC |
| 39 | MCTZ | MCT TRANSPORTATION LLC | | | SCAC4 |
