The IATA Operational Safety Audit (IOSA) is the benchmark for global safety management in airlines. All IATA members are registered and must remain registered in order to maintain IATA membership. See the applicability of IOSA standards and recommended practices (ISARPs).
Current list of IOSA registered airlines:
Found 412 operators
| Name | IATA code | ICAO code | Country / Territory | Region | Expiry Date |
| West Air Co Ltd | PN | CHB | China (People's Republic of) | China & North Asia | 23 April 2025 |
| WestJet | WS | WJA | Canada | The Americas | 27 November 2024 |
| WestJet Encore | WR | WEN | Canada | The Americas | 3 December 2024 |
|
White Airways SA
Registration has been suspended until 27 August 2023 |
WI | WHT | Portugal | Europe | 29 May 2023 |
| Wideroes Flyveselskap AS | WF | WIF | Norway | Europe | 28 January 2024 |
| Wizz Air Hungary Airlines Ltd | W6 | WZZ | Hungary | Europe | 16 October 2023 |
| Wizz Air UK | W9 | WUK | United Kingdom | Europe | 7 November 2024 |
| World2fly | 2W | WFL | Spain | Europe | 12 November 2023 |
|
Xiamen Airlines
The Operator’s Initial Registration Audit/ Renewal Audit has been performed as a full scope Hybrid Audit |
MF | CXA | China (People's Republic of) | China & North Asia | 5 March 2025 |
| YTO Cargo Airline | YG | HYT | China (People's Republic of) | China & North Asia | 22 March 2025 |