If you are at Dayton, Ohio, you might want to visit the National Museum of the United States Air Force which located at historic Wright Field. I have never been there, but it looks nice from what I have seen in their website so far. That just my observation. I've been in a similar museum not too far from Urbana, Illinois which is a cool one to visit too. The one in Dayton is opens on 4th of July. Might be crowded.
National Museum Of The United States Air Force
July 2, 2009