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There are a few reasons that German planes might have flown over a city after it had surrendered. For example, they may have been recording propaganda.
No only on planes.
Of course, planes can fly.
Nobody can fly only birds ,planes and helicopters so no
As opposed to flying what else - -
it can fly
In my plane it is about 15 minutes. Planes vary in speed and capability though.
Only for short periods.
Only jet fighter planes break sound barrier now.
How do heat engine allow planes to fly
At night - or in bad weather where visibility is too poor to fly by using landmarks.
They both fly. The only difference is that a ballon has helium to make it fly but air planes use gas to make it fly.