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Other airplanes. Also the ground.

But the simple autopilots (think an old Cessna) don't even try to avoid the ground for you. If you set it and forget it, you may find yourself dead on a mountainside.



You can absolutely crash a modern plane by entering altitude 0. https://www.bbc.com/news/world-europe-32063587


There are runways below sea level.

And low pressure zones.




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