So apparently there was this plane circling over the White House on 9/11.  I really don't know what to say about it, but it's interesting that not many people mentioned it at all; even the 9/11 commission failed to mention it. 

Some ID'ed the plane as Air Force, one who's specific purpose was to run the government in case of a nuclear attack, but some say that this was used for a different purpose: running the terrorist attacks.  Again, I really don't know what to believe here, but it's something to look at.

Here's what CNN has on it: 
http://www.cnn.com/video/#/video/us/2007/12/01/yir.mystery.plane.cnn