| 1 | Z4 | Zircon Airways Benin, S.A. | ICAO: BZW, Callsign: Zircon, IATA Prefix: 573, Founded in 2001. Ceased operations in 2002. | DY | AVCODES |
| 2 | Z4 | Puma Linhas Aereas Ltda | ICAO: PLY, Callsign: Puma Brasil, Founded in 2002. Ceased operations on 16 August 2011. Name changed from Puma Air Linhas Aereas | BR | AVCODES |
| 3 | Z4 | Zoom Airlines, Inc. | ICAO: OOM, Callsign: Zoom, IATA Prefix: 389, Ceased Operations and filed for Bankruptcy protection on 28 August 2008. | CDN | AVCODES |
| 4 | Z4 | Zagros Air | ICAO: GZQ, IATA Prefix: 541, Name changed to Zagrosjet Airlines in Augsut 2013. Affiliate of Atlasjet Turkey | IRQ | AVCODES |
| 5 | Z4 | Zagrosjet Airlines | ICAO: GZQ, IATA Prefix: 541, Ceased operations during March 2018. Name changed to Zagros Air in August 2013. Affiliate of Atlasjet Turkey | IRQ | AVCODES |
