Stonehenge Air Museum is an aviation museum near Fortine, Montana, operated as a 501(c)(3) nonprofit. It displays more than two dozen vintage aircraft, including a rare airworthy Mk 47 Seafire, and is noted for preserving historic aircraft not only for exhibit but also in flying condition. The site also includes the Crystal Lakes Resort Airport, which is open by invitation only except in emergencies. Its significance lies in maintaining and presenting historic aviation equipment as living aircraft rather than static artifacts alone.