| 1 | NSO | Aerolineas Sosa, S.A. | IATA: P4, Callsign: Sosa, Desginator P4* reinstated byIATA | HN | AVCODES |
| 2 | NSO | Aerolineas Sosa | | | ICAO1 |
| 3 | NSO | Norfolk Southern R.R. | Real: NS, The old Norfolk Southern company, before the merger with Norfolk Western. | USA | TRAFFIC |
| 4 | NSOF | NINE ZERO SIX ONE- FIVE FOUR SEVEN | | | SCAC4 |
| 5 | NSOP | NORTH SHORE OIL & PROPANE INC | | | SCAC4 |
| 6 | NSOQ | NINE ONE SIX ZERO-ONE ONE THREE | | | SCAC4 |
| 7 | NSOU | NORDIC SHELTER AS | | N | BIC |
| 8 | NSOU | NORDIC SHELTER AS | | | SCAC4 |
| 9 | NSOX | Shell Canada Ltd. | added 10/1963; 7/1965-4/1970; eliminated 1/1974 | | NAKINA |
| 10 | NSOX | North Star Oil Division of Shell Oil Co. of Canada, Ltd. | added 1/1962; eliminated 10/1963 | | NAKINA |
| 11 | NSOX | North Star Oil, Ltd. | 7/1930-4/1961; eliminated 1/1962 | | NAKINA |
| 12 | NSOX | North Star Oil, Ltd. | 4/38-4/61; eliminated 1/62 | | NRHS |
| 13 | NSOX | North Star Oil Division of Shell Oil Co. of Canada, Ltd. | added 1/62 | | NRHS |
| 14 | NSOX | Shell Canada Ltd. | 7/65-4/70; eliminated 1/74 | | NRHS |
| 15 | NSOX | SHELL CANADA LTD. [NORTH STAR OIL, LTD.] | | | PWRC |
