They do the tours via docent every 30 min or so. You pay the fee for the tour, hang out in the cafe area and then the guide comes by, shows you some photos, gives you some history, then takes you out where you get to tour the plane and get more history and see more photos.
Perhaps, they charge a desperate fee for the Presidents Plane, which would cause me to believe they would let you do that separately. The staff is very helpful and friendly, and my gut reaction is that they would.
I domt5belive so
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