According to Judge William Young, an airplane is not a vehicle.
According to something called the Dictionary Act of the US code. (Look in Title 1, Chapter 1, Section 4)
The word ''vehicle'' includes every description of carriage or other artificial contrivance used, or capable of being used, as a means of transportation on land.
Yep! Once that birdy takes off, it is no longer a vehicle. Once again, Congress has failed to keep up with the technology. Actually, I'm guessing most in congress don't even know this legal loophole existed. The full, sad story by Timothy Noah can be read here!