| 1 | NCS | Simpson Air Ltd. | Callsign: Commuter Canada, | CDN | AVCODES |
| 2 | NCS | Simpson Air Ltd. | IATA: 7B, Callsign: Commuter Canada, Designator recalled by IATA | CDN | AVCODES |
| 3 | NCS | Simpson Air Ltd | | | ICAO1 |
| 4 | NCS | NISEI CHARTER SERVICE | | | SCAC4 |
| 5 | NCS | Dutch Central Railway Company | | NL | TRAFFIC |
| 6 | NCS | Nuclear Cargo Servicse GmbH | | DE | VKM |
| 7 | NCSC | NANSEMOND COLD STORAGE COMPANY | | | SCAC3 |
| 8 | NCSD | NORTHCOAST SDD TRANSPORT INC | | | SCAC3 |
| 9 | NCSD | NOVA CENTURY SCIENTIFIC INC | | | SCAC4 |
| 10 | NCSE | NORCROSS SERVICE STATIONS INC | | | SCAC4 |
| 11 | NCSF | NECO SEED FARMS INC | | | SCAC4 |
| 12 | NCSG | NATIONAL COURIER SERVICE INC | | | SCAC4 |
| 13 | NCSI | NCR ATM SERVICES INC | | | SCAC3 |
| 14 | NCSI | NOBEL CARGO SYSTEMS INC | | | SCAC4 |
| 15 | NCSK | NEW CARGO SERVICE INC | | | SCAC4 |
| 16 | NCSL | NORTH COAST SALVAGE | | | SCAC3 |
| 17 | NCSM | NATIONAL CARGO SYSTEMS LTD | | | SCAC4 |
| 18 | NCSO | NASH, CHAS & SONS CORP | | | SCAC3 |
| 19 | NCSO | NOR-CAL SEAFOOD INC | | | SCAC4 |
| 20 | NCSP | NORTHWEST CARTAGE SPECIALISTS | | | SCAC3 |
| 21 | NCSP | NEW CREATION SHIPPING INC | | | SCAC4 |
| 22 | NCSQ | NORTHWEST CARTAGE SERVICE COMPANY I | | | SCAC3 |
| 23 | NCSQ | NORTH COUNTIES SUPPLY CO INC | | | SCAC4 |
| 24 | NCSR | NEW CARIBBEAN SERVICE RATE AGREEMEN | | | SCAC3 |
| 25 | NCSTL | Nashville, Chattanooga and St. Louis | | USA | TRAFFIC |
| 26 | NCSU | ORANO NCS GMBH | | D | BIC |
| 27 | NCSU | NUCLEAR CARGO & SERVICE GMBH | | | SCAC4 |
| 28 | NCSW | NEWPORT CARGO S A | | | SCAC4 |
| 29 | NCSX | Nucor Steel Seattle Inc. | added 7/2008 | | NAKINA |
| 30 | NCSX | NOVA Chemicals (USA) Inc. | eliminated 7/2000; 7/2000 (not listed) | | NAKINA |
| 31 | NCSX | Merchants Despatch Transportation Corp. | added 7/1962; 7/1965-10/1966; eliminated 7/1967 | | NAKINA |
| 32 | NCSX | Northern Refrigerator Line, Inc. | added 7/1961; eliminated 7/1962 | | NAKINA |
| 33 | NCSX | National Car Repair Shops, Inc. | eliminated 1/1954 | | NAKINA |
| 34 | NCSX | Merchants Despatch Transportation Corp. | 7/65-10/66; eliminated 7/67 | | NRHS |
| 35 | NCSX | NOVA Chemicals (USA) Inc. | 7/2000; eliminated 7/2000 | | NRHS |
| 36 | NCSX | *NATIONAL CAR REPAIR SHOPS, INC. | | | PWRC |
| 37 | NCSX | *MERCHANTS DESPATCH TRANSPORTATION CORP. [NORTHERN REFRIGERATOR LINE, INC.] | | | PWRC |
| 38 | NCSX | *NOVA CHEMICALS (USA), INC. | | | PWRC |
| 39 | NCSX | +NUCOR STEEL SEATTLE INC. | | | PWRC |
| 40 | NCSX | NUCOR STEEL SEATTLE INC | | | SCAC4 |
| 41 | NCSY | NORTH COAST SUPPLY | | | SCAC4 |
