911: President George W. Bush Arrives at Offutt Air Force Base, 09/11/2001. | by The U.S Archives

This story from Politico is a worth while read. It gives a good idea of what was happening aboard the plane after the attacks. The amount of uncertainty was huge, but it was interesting to see how people buckled down and focused on their jobs. Everyone from the pilots to the Secret Service were doing what they had trained to do.