the fan blows air into the 'skirt' inflating it. Then it is hovering and can move around as if on ice.
airplanes are the same thing as hovercrafts... but only hovercrafts have a louder engine
on a cushion of air
yes
hovercrafts
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.
4 ft
6 inches
Very good conditions!
walk
They both fly I think 
"Hovercrafts" are available now and have been.