The Ninety-Nines Museum of Women Pilots (MWP) is a non-profit museum and research institute that seeks to preserve the unique history of women in aviation. It is located on the second story of the international headquarters building of the non-profit International Organization of Women Pilots: The Ninety-Nines ("99s") on the grounds of Will Rogers World Airport in Oklahoma City, Oklahoma. The 5,000-square-foot (460 m2) museum houses the largest collection of historical women aviator artifacts in the world.