A B-29 flew over Fort Collins twice this morning. There is an airshow at a local airport featuring Fifi and a C-45 called Bucket of Bolts.
I heard the rumble of engines and walked to where I could see the sky better. And there she came, no more than 5,000 AGL, heading north. About 20 minutes later she flew over again, this time from east to west.
About an hour later I saw a C-45 in military colors.