Replacement parts are the big issue with aircraft, which also require a LOT of maintenance.
There was a rather indepth discussion some time ago about aircraft on this forum. One of the points that has stuck in my mind against there being many aircraft is that if a tank breaks down (or suffers damage), it stops. If a plane breaks down while in motion, it doesn't stop.....until it hits the ground.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
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