> To my understanding, there are millions of wires and pieces that all have to be working perfectly to keep a plane in the air
This is incorrect because aircraft have redundancy on critical systems. They don’t have to be perfect to fly, in fact they’re even allowed to take off in some situations despite known existing faults. That’s not to say that a single screw missing can’t eventually cause a crash in very rare circumstances.
In short, aircraft are designed, to the extent possible and economical, to keep flying and save lives even in the event of a fault.
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