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The flight endurance record is the longest amount of time an aircraft of a particular category spent in flight without landing. It can be a solo event, or multiple people can take turns piloting the aircraft, as long as all pilots remain in the aircraft. The limit initially was the amount of fuel that could be stored for the flight, but aerial refueling extended that parameter. Due to safety concerns, the Fédération Aéronautique Internationale (FAI) no longer recognizes new records for the duration of crewed airplane or glider flights and has never recognized any duration records for helicopters.