Hovercrafts originated in the late 1950s, with significant development led by British engineer Christopher Cockerell. He conceptualized the vehicle's design using a combination of air cushion technology and a fan system, which allowed it to travel over land and water with minimal friction. The first successful hovercraft, the SR.N1, was built in 1955 and showcased the potential of this innovative mode of transport. Since then, hovercrafts have been utilized for various applications, including transportation, rescue operations, and military use.
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.
6 inches
4 ft
Very good conditions!
walk
They both fly I think 
"Hovercrafts" are available now and have been.