Charles Talleyrand wrote:

Hovercraft and surface-effect craft are not regulated by the FAA.

How

high must one fly before one falls under the pervue of the FAA? Is
there an official definition of "aircraft" that excludes hovercraft

and

surface effect vehilcles?

Yeah, aircraft that fly thru the air are aircraft and thus regulated by
the FAA. Hovercraft and surface effect craft don't fly, take the ground
away and they don't work.