| 1 | N4 | National Airlines (Chile), S.A. | ICAO: NCN, Callsign: National, Designator recalled by IATA | RCH | AVCODES |
| 2 | N4 | Minerva Airlines | ICAO: MTC, Callsign: Air Minerva, Ceased operations on 25 October 2003 due bankruptcy. IATA designator changed from Q2*, then changed from Q9* | I | AVCODES |
| 3 | N4 | NAC Network Inc. d/b/a NACNET Inc. | Designator N4* recalled by IATA | USA | AVCODES |
| 4 | N4 | LLC "Nord Wind" | ICAO: NWS, Callsign: Nordland, IATA Designator changed to N4. | RUS | AVCODES |
| 5 | N4 | LLC "Nord Wind" | ICAO: NWS, Callsign: Nordland, IATA Designator changed from N4*. | RUS | AVCODES |
