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Maybe it was a bad idea to name the plane “Black Cat.” On an April 21, 1945, bombing mission over Regensburg, Germany, the B-24 Liberator flew into a flakstorm and became the last American air casualty of the war in Europe. Today, Tom Childers, author of Wings of Morning: The Story of the Last American Bomber Shot Down Over Germany in World War II, traces the fates of the two crew members who bailed out in time and the 10 who didn’t. At 1 p.m. at the National Air & Space Museum’s Lower Level Briefing Room, 6th & Independence Ave. SW. FREE. (202) 357-2700. (GK)