| 1 | U5 | International Business Air | ICAO: IBZ, Callsign: Interbiz, Designator U5 reinstated by IATA | S | AVCODES |
| 2 | U5 | Brendan Airways, LLC d/b/a USA 3000 | ICAO: GWY, Callsign: Getaway, Founded in 2001. Ceased operations on 30 January 2012. | USA | AVCODES |
| 3 | U5 | Karinou Airlines | ICAO: KRN, Designator U5* recalled by IATA | RCA | AVCODES |
| 4 | U5 | Aura Airlines S.L. | ICAO: GWR, Callsign: Lemon, Ceased operation on 27 October 2022. Name changed from Aura Airlines S.L. t/a Gowair Vaction Airlines. Designator G6 recalled by IATA. | E | AVCODES |
| 5 | U5 | United Nigeria Airlines Company Limited | ICAO: NUA, Callsign: United Nigeria, | WAN | AVCODES |
