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Jim Meinert, left, executive director of The History Museum in Great Falls, explains the historic route a C-54E Skymaster named “Spirit of Freedom” will fly over Great Falls, Mont., to Petra Heussner-Walker, right, honorary consul of Germany to Wash. and Mont., Sept. 9, 2016. The Spirit of Freedom flew a historic route that C-54 pilots and crews used for training in preparation for the Berlin Airlift. (U.S. Air Force photo/Tech. Sgt. Chad Thompson)