Can bugs fly at high altitudes? if not, why?

Question

like, i never see bugs flying over 10 feet, why?

Answer 1

Certain bugs can fly higher.   Some will stay lower due to wind currents and air temperatures

Answer 2

Maybe because the partial pressure of oxygen is lower at higher altitudes and it is harder for the insects to uptake oxygen. And it takes a lot of oxygen to maintain the energetic costs of flight.

Answer 3

cuz you are close to the ground... they are up there.