| 1 | MSC | Moscow Airways | IATA: M8, | RUS | AVCODES |
| 2 | MSC | Air Cairo | IATA: CE, IATA Prefix: 381, IATA designator changed to SM. Founded in 2003 | ET | AVCODES |
| 3 | MSC | Air Cairo | IATA: SM, IATA Prefix: 381, IATA designator changed to SM. Founded in 2003 | ET | AVCODES |
| 4 | MSC | Air Cairo | | | ICAO1 |
| 5 | MSC | Mississippi Central R.R. | 8/1920-10/1966 | | NAKINA |
| 6 | MSC | Illinois Central Gulf R.R. | 1/1975-1/1980 | | NAKINA |
| 7 | MSC | Mississippi Central R.R. | 4/38-10/66 | | NRHS |
| 8 | MSC | Illinois Central Gulf R.R. | 1/75-1/80 | | NRHS |
| 9 | MSC | *ILLIONOS CENTRAL GULF RAILROAD [MISSISSIPPI CENTRAL RAILROAD COMPANY] | | | PWRC |
| 10 | MSC | *MONITOR SUGAR | | | PWRC |
| 11 | MSC | Mississippi Central (Illinois Central Gulf Railroad) | | | RSRV |
| 12 | MSC | MASTERS COACH LTD, THE | | | SCAC4 |
| 13 | MSCC | M S CARRIERS | | | SCAC1 |
| 14 | MSCC | MOBILE SATELLITE CONNECTION LLC | | | SCAC4 |
| 15 | MSCD | M L S CARRIERS INC | | | SCAC4 |
| 16 | MSCE | MARTIN STORAGE CO INC | | | SCAC4 |
| 17 | MSCF | MARCONSULT SCHIFFAHRT GMBH & CO KG | | | SCAC4 |
| 18 | MSCG | MULTI SCALE CHARGE LTD | | | SCAC4 |
| 19 | MSCH | MEUNERIE ST-CHRYSOSTOME INC | | | SCAC4 |
| 20 | MSCH | Museumsbahn Schönheide | | D | TRAFFIC |
| 21 | MSCI | Mississippi Central R.R. Co. | added 4/1998; 7/2000; eliminated 10/2001; 7/2005 | | NAKINA |
| 22 | MSCI | Mississippi Central R.R. Co. | added 4/98; 7/2000 | | NRHS |
| 23 | MSCI | MISSISSIPPI CENTRAL RAILROAD COMPANY | | | PWRC |
| 24 | MSCI | Mississippi Central (Illinois Central Gulf Railroad) | | | RSRV |
| 25 | MSCI | MISSISSIPPI CENTRAL RAILROAD COMPAN | | | SCAC4 |
| 26 | MSCJ | MILLERS SALES & SERVICE | | | SCAC4 |
| 27 | MSCK | MST TRUCKING, INC | | | SCAC1 |
| 28 | MSCK | M S T TRUCKING INC | | | SCAC4 |
| 29 | MSCL | MISSISSIPPI COAST LIMOUSINE SERVICE | | | SCAC4 |
| 30 | MSCN | MOREVES | | | SCAC4 |
| 31 | MSCO | MITSUBISHI SHIPPING CO | | | PWRC |
| 32 | MSCP | MILES SHIPPING CORPORATION | | | SCAC4 |
| 33 | MSCQ | MACSA TECHNOLOGY INC | | | SCAC4 |
| 34 | MSCR | MASSACHUSETTS CENTRAL RAILROAD CO. | | | PWRC |
| 35 | MSCS | MASCO SYSTEMS INC | | | SCAC4 |
| 36 | MSCU | MSC- MEDITERRANEAN SHIPPING COMPANY S.A. | | CH | BIC |
| 37 | MSCU | MEDITERRANEAN SHIPPING CO. S.A. | | | PWRC |
| 38 | MSCU | Mediterranean Shipping | | | RSRV |
| 39 | MSCU | MEDITERRANEAN SHIPPING CORP | | | SCAC1 |
| 40 | MSCU | MSC-MEDITE | | | SCAC4 |
| 41 | MSCW | MARTIN, S CARTAGE INC | | | SCAC4 |
| 42 | MSCX | North American Car Corp. | added 7/1955; 10/1957-1/1975; eliminated 4/1975 | | NAKINA |
| 43 | MSCX | Mather Stock Car Co. | 7/1935-7/1954; eliminated 7/1955 | | NAKINA |
| 44 | MSCX | Mather Stock Car Co. | 4/38-1/52; eliminated 7/55 | | NRHS |
| 45 | MSCX | North American Car Corp. | added 7/55; 10/57-1/75; eliminated 4/75 | | NRHS |
| 46 | MSCX | *MICHIGAN STAR CLIPPER | | | PWRC |
| 47 | MSCX | *(NATX) NORTH AMERICAN CAR CORP [MATHER STOCK CAR CO. (NCCo)] | | | PWRC |
| 48 | MSCX | MTACC EAST SIDE ACCESS | | | SCAC4 |
| 49 | MSCZ | *MEDITERRANEAN SHIPPING COMPANY | | | PWRC |
| 50 | MSCZ | *MONTANA SULFUR & CHEMICAL CO. | | | PWRC |
| 51 | MSCZ | Mediterranean Shipping | | | RSRV |
| 52 | MSCZ | MEDITERRANEA | | | SCAC4 |
