I don't think we're disagreeing so much as making unrelated points. I'm arguing that if someone modified a Honda Civic so that it could fly and then said, "this

I don't think we're disagreeing so much as making unrelated points. I'm arguing that if someone modified a Honda Civic so that it could fly and then said, "this is an airplane now, so I don't need to register it as a car or obey the speed limit when I drive it on the highway," then they are either full of shit or lying to themselves. If you use it as a car, you need to comply with laws for cars.