Rewatch Flubber to see why a flying corvette is a terrible idea in today's infastructure of power lines, houses, street lights, trees and airplanes.

Even if you had Tony Stark's ark reactor as the power source, a true flying car would need drone blades, a literal jet engine or steal whatever the UFOs are using right now to stay in the air...

We'd probably do better with magnetic hover cars, kinda like how bullet trains work... But they wouldn't be able to get off the ground past the magnetic barrier. Read the book: the uglies, they have whole cities with mag-streets for flying hover cars.