What is IOSA, why is it important and who has it?Today The International Air Transport Association (IATA) released the 2014 commercial aviation safety performance results. Apparent from these results is the importance of and adherance to IOSA (IATA* Operational Safety Audit) in preventing air accidents. AirlineRatings.com's unique seven star safety rating system allocates two of its seven available stars to airlines that have completed and passed the IOSA audit.