| 1 | NS | Silk Route Airways | ICAO: GSR, Callsign: Silkroute Airways, Name changed to Caucasus Airlines, ICAO desigantor changed to SRJ. ICAO callsign changed to Caucasus. | GE | AVCODES |
| 2 | NS | NFD Nuernberger Flugdienst Luftverkehrs AG | ICAO: NFD, Callsign: Flamingo, Merged into Eurowings | D | AVCODES |
| 3 | NS | Northeast Airlines Ltd. | Callsign: Norjet, Merged into BEA. | GB | AVCODES |
| 4 | NS | Caucasus Airlines | ICAO: SRJ, Callsign: Caucasus, Ceased operations. Name changed from Silk Route Airways. ICAO designator changed from GSR. ICAO callsign changed from Silkroute Airways | GE | AVCODES |
| 5 | NS | Northeast Airlines Co. Ltd. | ICAO: DBH, IATA Prefix: 836, Name changed to Hebei Airlines. Taken over by Sichuan Airlines and renamed Hebei Airlines. | PRC | AVCODES |
| 6 | NS | Hebei Airlines Co., Ltd. | ICAO: HBH, Callsign: Hebei Air, IATA Prefix: 836, Name changed from Northeast Airlines Co. Ltd. | PRC | AVCODES |
| 7 | NS | Norfolk Southern Ry. Co. (Norfolk Southern) | 7/2005 | | NAKINA |
| 8 | NS | Norfolk Southern Ry. Co. | added 1/1991; 1/1994-7/2000 | | NAKINA |
| 9 | NS | Southern Ry. System | eliminated 1/1991 | | NAKINA |
| 10 | NS | Norfolk Southern Ry. Co. | 1/1975-1/1980 | | NAKINA |
| 11 | NS | Norfolk Southern R.R. (Co.) | 8/1920-10/1966 | | NAKINA |
| 12 | NS | Norfolk Southern R.R. | 4/38-10/66 | | NRHS |
| 13 | NS | Norfolk Southern Ry. Co. | 1/75-1/80 | | NRHS |
| 14 | NS | Southern Ry. System | eliminated 1/91 | | NRHS |
| 15 | NS | Norfolk Southern Ry. Co. | added 1/91; 1/94-7/2000 | | NRHS |
| 16 | NS | NORFOLK SOUTHERN [SOUTHERN RWY; NORFOLK SOUTHERN (OLD)] | | | PWRC |
| 17 | NS | Norfolk Southern Railway | | | RSRV |
| 18 | NS | NORFOLK SOUTHERN RAILWAY COMPANY (N | | | SCAC4 |
| 19 | NS | Nederlandse Spoorwegen | | NL | TRAFFIC |
| 20 | NS | Nederlandse Spoorwegen | | NL | VKM |
| 21 | NS&T | Niagara, St. Catharines & Toronto Ry. (Canadian National Rys.) | 8/1920-7/1936 | | NAKINA |
| 22 | NS&T | CANADIAN NATIONAL RWYS. [NIAGARA, ST. CATHARINES & TORONTO RWY.} | | | PWRC |
| 23 | NSA | Nile Safaris Aviation | Callsign: Nile Safaris, | SUD | AVCODES |
| 24 | NSA | Nile Safaris Aviation | | | ICAO1 |
| 25 | NSA | Norfolk Southern Railway Company | Real: NS | USA | TRAFFIC |
| 26 | NSAA | NORTHERN SALES | | | SCAC4 |
| 27 | NSAB | NORTH STAR ONE (1) AUTO SALES & REN | | | SCAC4 |
| 28 | NSAC | NORTH STAR AIR CARGO INC | | | SCAC4 |
| 29 | NSACZ | Miejskie Przedsiębiorstwo Komunikacyjne w Nowym Sączu | | PL | TRAFFIC |
| 30 | NSAE | NORTH SHORE AIR EXPRESS INC | | | SCAC3 |
| 31 | NSAI | NATIONAL SERV-ALL OF FORT WAYNE | | | SCAC3 |
| 32 | NSAI | NORTHSTAR AEROSPACE INC | | | SCAC4 |
| 33 | NSAJ | NOSAT | | | SCAC4 |
| 34 | NSAL | NORTE SUR AMERICANA LOGISTICS | | | SCAC3 |
| 35 | NSAR | NORTH STAR TRUCKING SERVICES INC | | | SCAC4 |
| 36 | NSAT | NAFTOMAR SHIPPING AND TRADING CO LT | | | SCAC3 |
| 37 | NSAT | NAFTOMAR SHIPPING AND TRADING CO LT | | | SCAC4 |
| 38 | NSAU | THE NATIONAL SHIPPING CO OF SAUDI ARABIA | | SA | BIC |
| 39 | NSAU | NATL SHIPPING OF SAUDI ARABIA | | | SCAC3 |
| 40 | NSAU | NATIONAL SHIPPING CO OF SAUDI ARABI | | | SCAC4 |
| 41 | NSAW | NORCO (SAGINAW) | | | SCAC4 |
| 42 | NSAX | National Steel Corp. | 1/1975; added 1/1976; 1/1980-7/2005 | | NAKINA |
| 43 | NSAX | National Steel Corp. | 1/75-7/2000 | | NRHS |
| 44 | NSAX | NATIONAL STEEL CORPORATION | | | PWRC |
| 45 | NSAX | National Steel Corporation | | | RSRV |
| 46 | NSAX | NATIONAL STEEL CORPORATION | | | SCAC4 |
| 47 | NSB | | | N | TRAFFIC |
| 48 | NSB | Norges Statsbaner BA | | NO | VKM |
| 49 | NSBA | Neunkirchner Strassenbahn | City: Neunkirchen | D | TRAFFIC |
| 50 | NSBAG | Neusiedler Seebahn | | AT | VKM |
| 51 | NSBE | NISBET OIL COMPANY | | | SCAC4 |
| 52 | NSBK | NEW STAR BOOKS LTD | | | SCAC4 |
| 53 | NSBM | NESBITT, MIKE TRUCKING INC | | | SCAC4 |
| 54 | NSBR | NUSSBAUMER TRANSPORTATION | | | SCAC3 |
| 55 | NSBR | NINE ZERO SEVEN EIGHT-FOUR NINE FOU | | | SCAC4 |
| 56 | NSBS | NORTH STAR BUS SERVICE INC | | | SCAC3 |
| 57 | NSBT | NESBIT TRANSPORTATION COMPANY | | | SCAC3 |
| 58 | NSBT | NASSER | | | SCAC4 |
| 59 | NSBU | NATIONAL CENTE FOR ATMOSPHERIC | | | SCAC3 |
| 60 | NSC | Société de Transport Aerien de Mauritanie | Callsign: Trans-Societe, | RIM | AVCODES |
| 61 | NSC | Societe De Transport Aerien De Mauritanie | | | ICAO1 |
| 62 | NSC | Newtex S.S. | 1/1975-1/1980 | | NAKINA |
| 63 | NSC | Newtex S.S. | 1/75-1/80 | | NRHS |
| 64 | NSC | *NATIONAL STEEL CAR, LTD. | | | PWRC |
| 65 | NSC | *NEWTEX STEAMSHIP | | | PWRC |
| 66 | NSC | National Steel Car | | | RSRV |
| 67 | NSC | NORFOLK SOUTHERN CORPORATION | | | SCAC4 |
| 68 | NSC | NS Cargo | | NL | TRAFFIC |
| 69 | NSCA | NATIONWIDE SHIPPERS COOPERATIVE ASS | | | SCAC3 |
| 70 | NSCA | NATIONWIDE SHIPPERS COOPERATIVE ASS | | | SCAC4 |
| 71 | NSCB | NATIONAL SCHOOL BUS SERVICE INC | | | SCAC3 |
| 72 | NSCB | NINE ZERO THREE TWO-SEVEN NINE THRE | | | SCAC4 |
| 73 | NSCC | NORTH STAR COVER ALL LLC | | | SCAC4 |
| 74 | NSCD | NORTHERN STAR CATTLE COMPANY LTD | | | SCAC4 |
| 75 | NSCE | NORTHERN STAR COOPERATIVE SERVICES | | | SCAC4 |
| 76 | NSCF | NASSAU CHAUFFEUR SERVICES INC | | | SCAC3 |
| 77 | NSCH | NATURES SECOND CHANCE HAULING LLC | | | SCAC4 |
| 78 | NSCI | NETTLETON SPECIALIZED CARRIERS INC | | | SCAC3 |
| 79 | NSCK | NSC ARKHANGELSK | | | SCAC4 |
| 80 | NSCL | NASCO LINES INC | | | SCAC3 |
| 81 | NSCL | NASCO LINES INC | | | SCAC4 |
| 82 | NSCM | NORRIS SALES CO INC | | | SCAC4 |
| 83 | NSCO | NEWMAN-SMALLEY CORPORATION | | | SCAC3 |
| 84 | NSCO | NEWMAN-SMA | | | SCAC4 |
| 85 | NSCS | NATIONAL SHIPPING COMPANY OF SAUDI | | | SCAC4 |
| 86 | NSCT | Niagara, St. Catharines & Toronto | 1/1975-1/1980 | | NAKINA |
| 87 | NSCT | Niagara, St. Catharines & Toronto | 1/75-1/80 | | NRHS |
| 88 | NSCT | CN SYSTEM [NIAGARA, ST. CATHERINES & TORONTO RWY.] | | | PWRC |
| 89 | NSCT | Niagara, St. Catharines and Toronto Railway | | | RSRV |
| 90 | NSCU | NORTHERN SHIPPING COMPANY | | RUS | BIC |
| 91 | NSCU | NORFOLK SOUTHERN RAILWAY | | | PWRC |
| 92 | NSCU | NV NEDERLANDSCHE SPOORWEGEN | | | SCAC3 |
| 93 | NSCU | NORTHERN SHIPPING COMPANY | | | SCAC4 |
| 94 | NSCX | National Steel Car Ltd. | added 4/1981; 1/1994-7/2005 | | NAKINA |
| 95 | NSCX | National Steel Car Corp., Ltd. | added 1/1962; 7/1965-1/1980; eliminated 4/1981 | | NAKINA |
| 96 | NSCX | The National Supply Co. | 7/1923 | | NAKINA |
| 97 | NSCX | National Steel Car Corp., Ltd. | added 1/62; 7/65-1/80; eliminated 4/81 | | NRHS |
| 98 | NSCX | National Steel Car Ltd. | added 4/81; 1/94-7/2000 | | NRHS |
| 99 | NSCX | *NATIONAL SUPPLY CO. | | | PWRC |
| 100 | NSCX | +NATIONAL STEEL CAR LIMITED (NATIONAL STEEL CAR CORP.) | | | PWRC |
