| 1 | NSC | Société de Transport Aerien de Mauritanie | Callsign: Trans-Societe, | RIM | AVCODES |
| 2 | NSC | Societe De Transport Aerien De Mauritanie | | | ICAO1 |
| 3 | NSC | Newtex S.S. | 1/1975-1/1980 | | NAKINA |
| 4 | NSC | Newtex S.S. | 1/75-1/80 | | NRHS |
| 5 | NSC | *NATIONAL STEEL CAR, LTD. | | | PWRC |
| 6 | NSC | *NEWTEX STEAMSHIP | | | PWRC |
| 7 | NSC | National Steel Car | | | RSRV |
| 8 | NSC | NORFOLK SOUTHERN CORPORATION | | | SCAC4 |
| 9 | NSC | NS Cargo | | NL | TRAFFIC |
| 10 | NSCA | NATIONWIDE SHIPPERS COOPERATIVE ASS | | | SCAC3 |
| 11 | NSCA | NATIONWIDE SHIPPERS COOPERATIVE ASS | | | SCAC4 |
| 12 | NSCB | NATIONAL SCHOOL BUS SERVICE INC | | | SCAC3 |
| 13 | NSCB | NINE ZERO THREE TWO-SEVEN NINE THRE | | | SCAC4 |
| 14 | NSCC | NORTH STAR COVER ALL LLC | | | SCAC4 |
| 15 | NSCD | NORTHERN STAR CATTLE COMPANY LTD | | | SCAC4 |
| 16 | NSCE | NORTHERN STAR COOPERATIVE SERVICES | | | SCAC4 |
| 17 | NSCF | NASSAU CHAUFFEUR SERVICES INC | | | SCAC3 |
| 18 | NSCH | NATURES SECOND CHANCE HAULING LLC | | | SCAC4 |
| 19 | NSCI | NETTLETON SPECIALIZED CARRIERS INC | | | SCAC3 |
| 20 | NSCK | NSC ARKHANGELSK | | | SCAC4 |
| 21 | NSCL | NASCO LINES INC | | | SCAC3 |
| 22 | NSCL | NASCO LINES INC | | | SCAC4 |
| 23 | NSCM | NORRIS SALES CO INC | | | SCAC4 |
| 24 | NSCO | NEWMAN-SMALLEY CORPORATION | | | SCAC3 |
| 25 | NSCO | NEWMAN-SMA | | | SCAC4 |
| 26 | NSCS | NATIONAL SHIPPING COMPANY OF SAUDI | | | SCAC4 |
| 27 | NSCT | Niagara, St. Catharines & Toronto | 1/1975-1/1980 | | NAKINA |
| 28 | NSCT | Niagara, St. Catharines & Toronto | 1/75-1/80 | | NRHS |
| 29 | NSCT | CN SYSTEM [NIAGARA, ST. CATHERINES & TORONTO RWY.] | | | PWRC |
| 30 | NSCT | Niagara, St. Catharines and Toronto Railway | | | RSRV |
| 31 | NSCU | NORTHERN SHIPPING COMPANY | | RUS | BIC |
| 32 | NSCU | NORFOLK SOUTHERN RAILWAY | | | PWRC |
| 33 | NSCU | NV NEDERLANDSCHE SPOORWEGEN | | | SCAC3 |
| 34 | NSCU | NORTHERN SHIPPING COMPANY | | | SCAC4 |
| 35 | NSCX | National Steel Car Ltd. | added 4/1981; 1/1994-7/2005 | | NAKINA |
| 36 | NSCX | National Steel Car Corp., Ltd. | added 1/1962; 7/1965-1/1980; eliminated 4/1981 | | NAKINA |
| 37 | NSCX | The National Supply Co. | 7/1923 | | NAKINA |
| 38 | NSCX | National Steel Car Corp., Ltd. | added 1/62; 7/65-1/80; eliminated 4/81 | | NRHS |
| 39 | NSCX | National Steel Car Ltd. | added 4/81; 1/94-7/2000 | | NRHS |
| 40 | NSCX | *NATIONAL SUPPLY CO. | | | PWRC |
| 41 | NSCX | +NATIONAL STEEL CAR LIMITED (NATIONAL STEEL CAR CORP.) | | | PWRC |
| 42 | NSCX | National Steel Car Corporation | | | RSRV |
| 43 | NSCX | NATIONAL STEEL CAR CORP LTD | | | SCAC3 |
| 44 | NSCX | NATIONAL STEEL CAR LIMITED | | | SCAC4 |
| 45 | NSCY | NETTLETON SPECIALIZED CARRIERS INC | | | SCAC4 |
