Other good museums should you have the opportunity-

Southern Museum of Flight- Birmingham, AL
Almost right on airport property- 2-3 hours.

8th Airforce Museum- Savannah, GA
Phenomenal museum, very moving- right off Savannah's airport, close to I-95, $10 admission- 2-4 hours, depending on how fast you read and how much you linger.

Warner-Robins, GA (Macon area)- Air Force Museum, much expanded since I've been there, but was good when I was there. Fair distance from Macon, but if you are in the area..