You know you want this hovercraft. Sure it's pricey, but it can traverse land and sea and glide through the air at 70 mph.
A little more info, from Hammacher Schlemmer:
This is the hovercraft that glides over land and water yet also soars in the air up to 70 mph with the aid of integrated wings
A joystick controls three vertical rudders and the elevator, a twist friction-lock throttle controls forward speed, and a variable drive system controls the lift fan for hovering
Its low center of gravity and composite fiberglass/PVC hull enable it to operate in winds up to 25 mph and waves up to 6' when in flight.
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