To the best of my knowledge that hasn't been tried. Among other things, fatal crashes typically occur at speeds over 2x those of car crashes. There's no meaning

To the best of my knowledge that hasn't been tried. Among other things, fatal crashes typically occur at speeds over 2x those of car crashes. There's no meaningful ability to emergency brake before a crash, and many small airplanes don't have the weight budget to get the things that help you survive a crash, like crumple zones. An airbag won't do much if you're still going to be squeezed between the engine and tail of the plane at 180 mph.