A small aircraft flew into Air Force One's airspace Friday at 10:21 a.m. near Latrobe as President Bush's plane prepared to land in Pittsburgh, Secret Service officials said.
Military aircraft intercepted the plane and escorted it to an airfield in North Carolina. Secret Service agents interviewed the man, who had no passengers, and released him.
The pilot's name was not released.
Bush's schedule was not affected.
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The small planes "left the temporary flight restricted area relatively quickly."
Four pilots of antique airplanes were escorted out of no-fly area at benefit for the Experimental Aircraft Association and the Hagerstown Aviation Museum.
There have been similar alarms before, sparked by a blip on a radar screen that looks like an aircraft venturing into the area around the White House that is off-limits to aircraft.