Visitors gather for a private viewing of the Memphis Belle, a Boeing B-17 "Flying Fortress," at the National Museum of the U.S. Air Force, Wednesday, May 16, 2018, in Dayton, Ohio. The World War II bomber Memphis Belle is set to go on display for the first time since getting a yearslong restoration at the museum. The B-17 “Flying Fortress” will be introduced Thursday morning as the anchor of an extensive exhibit in the Dayton-area museum’s World War II gallery. (AP Photo/John Minchillo)