The flight from Pittsburgh to Phoenix is 4:40 and the flight FROM Phoenix to Pittsburgh is 4:02. Why is that?|||earths rotation is one reason the prevailing winds are another|||Flying East planes are going in the same direction as the jet stream. Flying West they have to fly against the wind. Is similar to rowing a boat downstream as opposed to rowing upstream.|||Because of the Earths rotation. East to West you are going "with" the rotation Going the other way, the Earth is spinning toward you.|||Above poster is partially right, but it is the wind up there that is the real reason.

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