Pilots are all put through the same paces to become a pilot. Planes are put through rigorous testing to become legal to fly.
Add in that planes aren’t near eachother most of the trip, and that unlike with a car, every pilot knows what the other is going to do (and radio someone in to tell them if it deviates from tradition).
Basically it boils down to standards and practices being at higher levels. Your less likely to have a cockpit with BOTH pilots drunk, yet in a car it’s much more likely kinda thing.
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