If you are ever anywhere near Dayton, OH this is well worth a two day side trip (you will need two days to do it justice).
I love planes. Spent the weekend here.http://www.airventure.org/
I agree 1000%. I work about 2 minutes from the Dayton AF Base. About 5 years ago I worked on a project on the base. We got a chance to spend a few days in the private section of the AF Museum. They have a HUGE hanger of nothing but things not on display. Uniforms,Flags,old soldier equipment,partially rebuilt planes, etc.. It has to be the best museum experience ever. I wish more people had a chance to get into those areas!!