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Maybe ditch the pilots. Autopilots can taxi, take off, cruise, respond to tower instructions, land. And aren't (as) affected by fume events.

Why put a weak link in the safety chain? Humans are so very fallible. Arguably more so than an autopilot.

Autopilots don't do any of those things without human in the loop

I think there are auto land systems.. at least in smaller planes there’s even a button for it.

Real auto land, CAT iii, is what you're thinking of and it requires specific things that most airports and planes don't have equipped

Autopilots largely rely on the normal function of the rest of the aircraft systems.