While admission is reasonable at $6, we were pleasantly surprised when the clerk only asked for our zip code. Admission is free on Sundays from 9-1.
Their weather lab exhibit was one of the best we've seen. It is especially good for sailors or aviators.
I highly recommend putting this museum on your itinerary. It fills in parts of aviation history that we didn't find at the Smithsonian or any of the military aviation museums.