I'd argue that there so many differences between air travel and medicine that it's not a useful comparison. A single passenger doesn't even interact with a Pilot, as just one example.
It sort of implies that there aren't strict procedures and double-checking in medicine. But there are. The problem is that medicine is more complicated with more people involved. You can't just say "hey, look in Engineering we can build bridges on time and under budget, why can't you do that with software?" The same issue here.
