The Metropolitan Washington Airports Authority says the body was found around 1:30 p.m. Saturday by ground crew members assigned to the aircraft. The Airbus A340 was sitting in a remote parking area at the time.
Airport officials say the circumstances of the man's death are under investigation. The body will be turned over to the Fairfax County Medical Examiner's Office for an autopsy.
Officials say operations at the airport were unaffected by the discovery.