I think this is ahistorical. Flying cars were always point to point "Jetson's" style vehicles, where you didn't HAVE a highway, because everyone just traveled a

I think this is ahistorical. Flying cars were always point to point "Jetson's" style vehicles, where you didn't HAVE a highway, because everyone just traveled as the crow flies. It's only when this was obviously impossible that futurists pushed the "mostly a car but can also fly sometimes" angle.