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I also don't really understand what's supposed to be the line between flying car and helicopter.

Does the flying car need to also be street legal on the ground? Does it just not have to look too much like a helicopter?

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I think it’s anything in the category of “way more common than a helicopter to the point where normal people use them”.

It needs to get through dense downtowns where there isn't much space between buildings, and wires and skyways to dodge as well. A skilled pilot could do it - but they wouldn't try because while space physically exists there isn't enough margin for error.

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