Airline codes| IATA | ICAO | Airline | Call sign | Country | Comments |
|---|
| BZE | Zenith Aviation | ZENSTAR | United Kingdom | 2014[1] |
| AZB | Zaab Air | ZAAB AIR | Ghana | |
| AZJ | Zas Air | | Egypt | |
| AZR | Zenith Air | ZENAIR | South Africa | |
| CDC | Zhejiang Loong Airlines | HUALONG | China | |
| CIT | Zanesville Aviation | ZANE | United States | |
| EMR | Zenmour Airlines | ZENMOUR | Mauritania | |
| EZD | Zest Airways | ZEST AIRWAYS | Philippines | |
| GZQ | Zagros Air | ZAGROS | Iraq | |
| C4 | IMX | Zimex Aviation | ZIMEX | Switzerland | |
| IZG | Zagros Airlines | ZAGROS | Iran | |
| JTU | Zhetysu | ZHETYSU | Kazakhstan | |
| KVZ | Z-Aero Airlines | | Ukraine | |
| KZH | Zhez Air | | Kazakhstan | |
| MBG | Zephyr Aviation | CHALGROVE | United Kingdom | |
| MLU | Zracno Pristaniste Mali Losinj | MALI LOSINJ | Croatia | |
| MZE | Zenith Aviation (Malta) | | Malta | |
| ORZ | Zorex | ZOREX | Spain | |
| PZY | Zapolyarye Airline Company | ZAPOLYARYE | Russia | |
| RZR | Zephyr Express | RECOVERY | United States | |
| RZU | Zhersu Avia | ZHERSU AVIA | Kazakhstan | |
| SYZ | Zil Air | ZIL AIR | Seychelles | |
| TAN | Zanair | ZANAIR | Tanzania | |
| ZAI | Zaire Aero Service | ZASAIR | Democratic Republic of Congo | |
| ZAK | Zambia Skyways | ZAMBIA SKIES | Zambia | |
| ZAR | Zairean Airlines | ZAIREAN | Domocratic Republic of Congo | |
| ZAV | Zetavia | ZETAVIA | Ukraine | |
| ZAW | Zoom Airways | ZED AIR | Bangladesh | |
| ZMA | Zambezi Airlines | ZAMBEZI WINGS | Zambia | |
| RZV | Z-Avia | ZEDAVIA | Armenia | ICAO Code and callsign no longer allocated |
| Q3 | MBN | Zambian Airways | ZAMBIANA | Zambia | |
| ZAN | Zantop International Airlines | ZANTOP | United States | ICAO Code and callsign no longer allocated |
| ZAS | ZAS Airlines of Egypt | ZAS AIRLINES | Egypt | ICAO Code and callsign no longer allocated |
| CJG | Zhejiang Airlines | ZHEJIANG | China | ICAO Code and callsign no longer allocated |
| CFZ | Zhongfei General Aviation | ZHONGFEI | China | |
| CYN | Zhongyuan Aviation | ZHONGYUAN | China | ICAO Code and callsign no longer allocated |
| 3J | WZP | Zip | ZIPPER | Canada | ICAO Code and callsign no longer allocated |
| ZG | TZP | Zipair Tokyo | ZIPPY | Japan | Subsidiary of Japan Airlines |
| Z4 | OOM | Zoom Airlines | ZOOM | Canada | defunct, ICAO Code and callsign no longer allocated |
| ORZ | Zorex | ZOREX | Spain | | |
