After seeing this: https://www.youtube.com/watch?v=QRb4zKBIt0I https://www.youtube.com/watch?v=QRb4zKBIt0I "Mayday Truth of Crash Air France Flight 447" The

After seeing this: https://www.youtube.com/watch?v=QRb4zKBIt0I https://www.youtube.com/watch?v=QRb4zKBIt0I "Mayday Truth of Crash Air France Flight 447" The main cause of the crash was speed sensors failures which trigger other actions. I can certainly see why the plane parts are so expensive. I also scratch built RC plane with my kid. We had a few crashes cause by loss wire connections between RC receiver and the servo. I was extremely glad it is just RC plane instead of the real plane and appreciate the real engineering / reliability build into the modem aircraft.