I am actually not really optimistic about vtols. To me, they dont make a lot of sense. We already have helicopters and few use them. A vtol is noting more than adding 3D to our transportation. We can accomplish this with tunnels.
In addition to the noise, what happens when parts start falling off over cities. It happens and could end up on someone's head.
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The metro is a very efficient transport system but tunnels are very expensive
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They are but so are flying machines.
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