Loss of the Liberty Belle.
It's not some people's thing, but we just lost one of our B-17's from WWII. There are only 15 or so left now. Restoring it was a big project that took the collective effort, time, and love of many, many people to make possible. Now it's gone. Even if the crew did nothing wrong I know they still feel so awful. :(
I'm glad I had a chance to see it once.