airplanes are the same thing as hovercrafts... but only hovercrafts have a louder engine
They both (some airplanes do) use propeller's.
All gliders are airplanes, but not all airplanes are gliders.
Yes, there are thousands of different airplanes.
Birds and airplanes both have wings.
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.
yes.
6 inches
4 ft
Very good conditions!