yes.
6 inches
airplanes are the same thing as hovercrafts... but only hovercrafts have a louder engine
hovercrafts
yes
on a cushion of air
Why are you asking where to find hovercrafts? But I would have to say, that scientists are trying to build some, or aliens are, but you should have known that already.
4 ft
Very good conditions!
walk
They both fly I think 
yes.are you stupid or .......?this is my question to you.