Flying car (aircraft)
The Waterman Aerobile at theSmithsonian
A flying car or roadable aircraft is an aircraft that can also travel along roads. All the working examples have required some manual or automated process of conversion between the two modes of operation.
A slightly different concept that is sometimes referred to as a "flying car", particularly in science fiction, is that of an aircraft that would be practical enough for every-day travel, but would not necessarily be drivable on the roads.