Here's a poser: is
this a flying car or a roadable aeroplane? In the 1940's Robert
Fulton, Jr. addressed the problem of what to do when you land
your private plane at an air field whose car hire service is throwing
a saddle on a nearby cow.
Fulton's solution was an example of thinking outside of the box.
Instead of building a car that flies, he made an aeroplane that turned
into a car. Land at a convenient field, unscrew the propeller,
detach the tail section and off you go.
And off they went was what Fulton's backers did, leaving the airphibian
with the first flying car American CAA certification and little else.