It is great
I live in Dayton, and I can tell you that the Air Force Museum is the finest aviation museum in the world. While the emphasis is on the Air Force (and Army Air Corps), it is worth the trip. Totally Free. Mostly staffed by volunteers.
It is very well done, constantly changing, always being enhanced, BIG (way bigger then the air and space museum in Washington), very clean and just plain fun. Many one of a kind planes are inside. There is a IMAX theater on site if you want to take a break from walking.
While in town, You can also visit the sites where the Wright Brothers lived, worked and flew their planes.
The Dayton 'area' also has the most extensive bicycle trails in the nation. No joke, just check it out online.
So, if you are coming to town and need some advice on other things to do or where to eat, shoot me a message.