https://fightersweep.com/6296/angle-...fm-engagement/
AOA vs Critical AOA
AOA systems have been on fighters for decades, and on heavy transport planes as well. But AOA has only recently gained more attention from the FAA and legislators for applications in General Aviation (GA) and business aircraft. One such highly publicized event that highlighted the significance of AOA was the crash of the Air France flight 447 Airbus in June 2009 that killed all 216 people on board.
Investigators concluded that the aircraft’s airspeed probes had iced over providing erroneous indications to the pilots, and that the AOA system and it’s “gauge” was not available to pilots in the cockpit. They also concluded that having an AOA gauge could have saved the stricken crew.