| 1 | X5 | Cronus Airlines | ICAO: CUS, Callsign: Cronus, IATA designator X5 recalled due merger with Aegean Airlines S.A. A3/AEE | GR | AVCODES |
| 2 | X5 | aeronova S.L.U. d/b/a Air Europa Express | ICAO: OVA, Callsign: Aeronova, | E | AVCODES |
| 3 | X5 | Sunworld International Airlines, Inc. | ICAO: SWI, IATA designator changed to SM | USA | AVCODES |
| 4 | X5 | Trans Pacific Air (Malaysia) SDN. BHD. | IATA designator changed to 4H | MAL | AVCODES |
| 5 | X5 | Airdirect Bedarfsflug GmbH | ICAO: DRR, Callsign: Aerodirect, Designator X5* recalled by IATA | A | AVCODES |
| 6 | X5 | Afrique Airlines, S.A. | ICAO: FBN, Callsign: Afrique-Benin, Founded in 2002. Commenced operations in 2003. Ceased operations during 2006. | DY | AVCODES |
| 7 | X5 | ULD Logistics LLC | Designator X5* recalled by IATA. Non-Airline Unit Load Devices (ULD) companies | USA | AVCODES |
| 8 | X5 | S.C. Ten Airways S.R.L. | ICAO: OTJ, Callsign: Tender Air, | RO | AVCODES |
| 9 | X50 | | | | TRAFFIC |
| 10 | X55 | | | | TRAFFIC |
