Commercial airlines are subject to many regulations than automobiles, and they fly along airways or air corridors just as cars travel on highways on the ground. International rules designed to keep airplanes well apart. planes generally must be at least 1,000 feet above or below one another, with ten minutes flying time between one another, and ten miles on either side. At takeoff, planes are separated by time intervals of one minute when going in different directions and two minutes when going in the same direction.
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