IS-BAO
The International Standard for Business Aircraft Operations is a code of best practice published by the International Business Aviation Council and audited by accredited third parties. It is built around a safety management system and has three stages: Stage 1 shows the SMS is in place, Stage 2 that it is functioning and managing risks, and Stage 3 that safety is embedded in the culture and sustained over time. Unlike ARGUS and Wyvern, IS-BAO is used by corporate flight departments and private operators as well as charter companies, and it is recognised worldwide, including by EASA-country regulators. Stage 3 is the most demanding of the three ratings and takes years to reach.