How do airplanes travel in air without colliding with each other? there are lots of planes taking off at a time and many travel in opposite directions at the same time? so how is it that all of them dont collide and why dont we see one in air?
[quote="ludmila"]How do airplanes travel in air without colliding with each other? there are lots of planes taking off at a time and many travel in opposite directions at the same time? so how is it that all of them dont collide and why dont we see one in air?
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