Helicopters are loud, expensive to operate and maintain, difficult to fly, slower than airplanes, and crash more often.

But, they are much more flexible in terms of where they can land. This “point to point” aspect is what people really mean by “flying car”.

If you had a quiet, inexpensive, safe, self-flying, small helicopter then I guess you’d have a flying car!

You can't choose when to drive it on wheels (slow but low energy consumption) and when to fly it (fast but high energy consumption) is the difference to me.

You can't land a helicopter in the middle of a city. It's too loud, and moves too much air, not to mention the danger of the propellers.