Original: The Wright brothers' December 17, 1903 flight is recognized by the Fédération Aéronautique Internationale, the standard setting and record-keeping body for aeronautics and astronautics, as "the first sustained and controlled heavier-than-air powered flight".
Simplified: The Fédération Aéronautique Internationale is the standard setting and record-keeping body for aeronautics and astronautics worldwide.