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Flying cars make sense in a different world. The world as it is today can't handle flying cars the way it can road cars. Besides, how do the cars land? Cars as planes need runways, and cars as helicopters need "personal space" away from other cars as helicopters.

And there is gravity,as you said.

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Yes, I think they can make maglev tracks up in the sky for faster travel. Won't be cheap though.

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