Uh...Moonshine? :3 Besides, the DeLorean retained it's gasoline engine as well: remember Pt. III? That's why they had to use the train: Marty ripped the gas line. (and subsequently got chased out of the cave by a bear.)
I kind of meant it as tongue-in-cheek: having cars become aircraft is asking for trouble. adding that third dimension adds a whole lot more to be aware of.
They did partner with VW to help them design something (probably interior stuff), but I'd point you toward the Chevrolet Volt for Apple-like design inside: