| 1 | MS | Egyptair | ICAO: MSR, Callsign: Egyptair, IATA Prefix: 077, Name changed from United Arab Airlines (UAA). ICAO designator changed form EGY | ET | AVCODES |
| 2 | MS | United Arab Airlines (UAA) | Name changed to Egypt Air | ET | AVCODES |
| 3 | MS | Egypt Air | ICAO: EGY, Callsign: Egyptair, IATA Prefix: 077, Name changed to Egyptair. ICAO designator changed to MSR. Name changed from United Arab Airlines (UAA) | ET | AVCODES |
| 4 | MS | Michigan Shore R.R., Inc. | added 7/1991; 1/1994-7/2005 | | NAKINA |
| 5 | MS | Missouri Southern R.R. Co. | 8/1920-1/1952 | | NAKINA |
| 6 | MS | Missouri Southern R.R. Co. | 4/38-1/52 | | NRHS |
| 7 | MS | Michigan Shore R.R., Inc. | added 7/91; 1/94-7/2000 | | NRHS |
| 8 | MS | *MISSOURI SOUTHERN RAILROAD CO. | | | PWRC |
| 9 | MS | +MICHIGAN SHORE RAILROAD, INC. | | | PWRC |
| 10 | MS | Michigan Shore Railroad | | | RSRV |
| 11 | MS | MICHIGAN SHORE RAILROAD INC | | | SCAC4 |
| 12 | MSA | Mistral Air Srl | Callsign: Airmerci, ICAO callsign changed to Mistral Wings | I | AVCODES |
| 13 | MSA | Mid-South Commuter Airlines | Callsign: Mid-South, | USA | AVCODES |
| 14 | MSA | Mistral Air S.r.l. | IATA: 7M, Callsign: Mistral Wings, IATA Designator changed to M4. ICAO callsign changed from Aiemerci | I | AVCODES |
| 15 | MSA | Mistral Air Srl | ICAO callsign changed to Aiemerci | I | AVCODES |
| 16 | MSA | Mistral Air S.r.l. | IATA: M4, Callsign: Mistral Wings, Name changed to Poste Air Cargo S.r.l. October 2019. IATA Designator changed from 7M. ICAO callsign changed from Aiemerci | I | AVCODES |
| 17 | MSA | Poste Air Cargo S.r.l. | IATA: M4, Callsign: Mistral Wings, IATA Prefix: 408, Name changed from Mistral Air S.r.l. October 2019. IATA Designator changed from 7M. ICAO callsign changed from Aiemerci | I | AVCODES |
| 18 | MSA | Mistral Air | | | ICAO1 |
| 19 | MSA | Mistral Air | Renamed to Poste Air Cargo in 2019 | I | TRAFFIC |
| 20 | MSAA | M S T S | | | SCAC4 |
| 21 | MSAB | MID SOUTH TRANSPORTATION LLC | | | SCAC4 |
| 22 | MSAC | MONT-SAINTE-ANNE | | | SCAC4 |
| 23 | MSAF | MOUNTAIN SPRINGS SPAS | | | SCAC4 |
| 24 | MSAG | MOTION CONCEPTS LP | | | SCAC4 |
| 25 | MSAH | MS TRANS | | | SCAC4 |
| 26 | MSAJ | MSA DELIVERY SERVICE | | | SCAC4 |
| 27 | MSAL | MARITIME SERVICES ALEUROPA GMBH | | | SCAC4 |
| 28 | MSAP | MODEVATION ENTERPRISES INC | | | SCAC4 |
| 29 | MSAQ | MORRIS LOGISTICS LLC | | | SCAC4 |
| 30 | MSAR | MS BLACK SHEEP TRUCKING COMPANY INC | | | SCAC4 |
| 31 | MSAS | MARTINEZ SOSA, ANTONIO Y SILVA | | | SCAC4 |
| 32 | MSAU | MAERSK A/S | | DK | BIC |
| 33 | MSAU | A P MOLLER | | | SCAC4 |
| 34 | MSAV | M & S TRUCKING CO | | | SCAC4 |
| 35 | MSAY | MILLTOWN COLONY FARMS LTD | | | SCAC4 |
| 36 | MSAZ | NATIONAL MOTOR FREIGHT TRAFFIC ASSOCIATION | | | PWRC |
| 37 | MSAZ | National Motor Freight Traffic Association | | | RSRV |
| 38 | MSB | CA Air Stork SRL | IATA: 0S, Callsign: Long, IATA designator changed to 2S*. | MD | AVCODES |
| 39 | MSB | CA Air Stork SRL | IATA: 2S, Callsign: Long, IATA designator changed from 0S*. | MD | AVCODES |
| 40 | MSBA | Metropolitan Suburban Bus Authority | | USA | TRAFFIC |
| 41 | MSBB | MS TRANSPORTES | | | SCAC4 |
| 42 | MSBC | MASTERLEAS | | | SCAC4 |
| 43 | MSBG | MARITIME SERVICES LINE ARGENTINA S | | | SCAC4 |
| 44 | MSBM | M & S BLASTING LLC | | | SCAC4 |
| 45 | MSBN | MIKES PRODUCE | | | SCAC4 |
| 46 | MSBP | Muscle Shoals, Birmingham & Pensacola Ry. Co. | 7/1923 | | NAKINA |
| 47 | MSBP | MUSCLE SHOALS, BIRMINGHAM & PENSACOLA RWY. CO. | | | PWRC |
| 48 | MSBQ | MIDAME | | | SCAC4 |
| 49 | MSBR | T L MOSBRUCKER & SON | | | SCAC3 |
| 50 | MSBT | MISSISSIPPI BULK TRANSPORT INC | | | SCAC4 |
| 51 | MSBU | MSC- MEDITERRANEAN SHIPPING COMPANY S.A. | | CH | BIC |
| 52 | MSBV | MORGAN STANLEY CAPITAL GROUP INC | | | SCAC4 |
| 53 | MSBW | MANBECK | | | SCAC4 |
| 54 | MSBY | MOSBYS INC | | | SCAC4 |
| 55 | MSC | Moscow Airways | IATA: M8, | RUS | AVCODES |
| 56 | MSC | Air Cairo | IATA: CE, IATA Prefix: 381, IATA designator changed to SM. Founded in 2003 | ET | AVCODES |
| 57 | MSC | Air Cairo | IATA: SM, IATA Prefix: 381, IATA designator changed to SM. Founded in 2003 | ET | AVCODES |
| 58 | MSC | Air Cairo | | | ICAO1 |
| 59 | MSC | Mississippi Central R.R. | 8/1920-10/1966 | | NAKINA |
| 60 | MSC | Illinois Central Gulf R.R. | 1/1975-1/1980 | | NAKINA |
| 61 | MSC | Mississippi Central R.R. | 4/38-10/66 | | NRHS |
| 62 | MSC | Illinois Central Gulf R.R. | 1/75-1/80 | | NRHS |
| 63 | MSC | *ILLIONOS CENTRAL GULF RAILROAD [MISSISSIPPI CENTRAL RAILROAD COMPANY] | | | PWRC |
| 64 | MSC | *MONITOR SUGAR | | | PWRC |
| 65 | MSC | Mississippi Central (Illinois Central Gulf Railroad) | | | RSRV |
| 66 | MSC | MASTERS COACH LTD, THE | | | SCAC4 |
| 67 | MSCC | M S CARRIERS | | | SCAC1 |
| 68 | MSCC | MOBILE SATELLITE CONNECTION LLC | | | SCAC4 |
| 69 | MSCD | M L S CARRIERS INC | | | SCAC4 |
| 70 | MSCE | MARTIN STORAGE CO INC | | | SCAC4 |
| 71 | MSCF | MARCONSULT SCHIFFAHRT GMBH & CO KG | | | SCAC4 |
| 72 | MSCG | MULTI SCALE CHARGE LTD | | | SCAC4 |
| 73 | MSCH | MEUNERIE ST-CHRYSOSTOME INC | | | SCAC4 |
| 74 | MSCH | Museumsbahn Schönheide | | D | TRAFFIC |
| 75 | MSCI | Mississippi Central R.R. Co. | added 4/1998; 7/2000; eliminated 10/2001; 7/2005 | | NAKINA |
| 76 | MSCI | Mississippi Central R.R. Co. | added 4/98; 7/2000 | | NRHS |
| 77 | MSCI | MISSISSIPPI CENTRAL RAILROAD COMPANY | | | PWRC |
| 78 | MSCI | Mississippi Central (Illinois Central Gulf Railroad) | | | RSRV |
| 79 | MSCI | MISSISSIPPI CENTRAL RAILROAD COMPAN | | | SCAC4 |
| 80 | MSCJ | MILLERS SALES & SERVICE | | | SCAC4 |
| 81 | MSCK | MST TRUCKING, INC | | | SCAC1 |
| 82 | MSCK | M S T TRUCKING INC | | | SCAC4 |
| 83 | MSCL | MISSISSIPPI COAST LIMOUSINE SERVICE | | | SCAC4 |
| 84 | MSCN | MOREVES | | | SCAC4 |
| 85 | MSCO | MITSUBISHI SHIPPING CO | | | PWRC |
| 86 | MSCP | MILES SHIPPING CORPORATION | | | SCAC4 |
| 87 | MSCQ | MACSA TECHNOLOGY INC | | | SCAC4 |
| 88 | MSCR | MASSACHUSETTS CENTRAL RAILROAD CO. | | | PWRC |
| 89 | MSCS | MASCO SYSTEMS INC | | | SCAC4 |
| 90 | MSCU | MSC- MEDITERRANEAN SHIPPING COMPANY S.A. | | CH | BIC |
| 91 | MSCU | MEDITERRANEAN SHIPPING CO. S.A. | | | PWRC |
| 92 | MSCU | Mediterranean Shipping | | | RSRV |
| 93 | MSCU | MEDITERRANEAN SHIPPING CORP | | | SCAC1 |
| 94 | MSCU | MSC-MEDITE | | | SCAC4 |
| 95 | MSCW | MARTIN, S CARTAGE INC | | | SCAC4 |
| 96 | MSCX | North American Car Corp. | added 7/1955; 10/1957-1/1975; eliminated 4/1975 | | NAKINA |
| 97 | MSCX | Mather Stock Car Co. | 7/1935-7/1954; eliminated 7/1955 | | NAKINA |
| 98 | MSCX | Mather Stock Car Co. | 4/38-1/52; eliminated 7/55 | | NRHS |
| 99 | MSCX | North American Car Corp. | added 7/55; 10/57-1/75; eliminated 4/75 | | NRHS |
| 100 | MSCX | *MICHIGAN STAR CLIPPER | | | PWRC |
