Rescuers scouring the high desert of Nevada this week turned up no sign of the airplane carrying Steve Fossett, the wealthy adventurer who holds numerous records for solo flight. Fossett, 63, disappeared early this week during an unaccompanied flight aboard a single-engine plane that took off from a Nevada ranch owned by hotel magnate Barron Hilton. Fossett did not file a flight plan but indicated he would return within a few hours. He holds many aviation records, including the longest nonstop solo balloon flight and the longest nonstop solo airplane flight. He was scouting locations for an attempt at the land-speed record when he disappeared.