The Stuka, or more specifically the 1941 Junkers Ju-87R-2 Tropical Stuka, a German WWII-era dive bomber, is exceedingly rare, one of two such intact aircraft left in the world. While it is undergoing servicing, which includes a 3-D computer scan, museumgoers can watch the crews work and get a closer look. They might notice the airplane is in less-than-perfect condition, though that's no fault of the MSI. There are bullet holes in the fuselage, which is part of the explanation of how it came to Chicago, says Kathleen McCarthy, the museum's director of collections. The Stuka was forced down in fighting over North Africa and made an emergency landing in Libya just before the British captured the German air base. After the war, it came to America as part of a tour of war relics put on by the British Information Services and was donated after the tour. That's also how the exhibit's companion plane came to be hanging at the MSI, McCarthy says.