Mystery 9/11 aircraft was military doomsday plane

Shortly before 10 am on the morning of September 11, 2001, amid rumors of a fourth hijacked plane headed for Washington, DC, a mystery aircraft appeared in restricted airspace over the White House. There has never been an official explanation for this incident, which has provided abundant fuel for 9/11 conspiracy theories.

So let me get this straight, the US Air Force had a 747 E-4B command ship flying over DC and the White House on the morning of 911 but not one F-16 from Langley? OK

http://rawstory.com//news/2007/CNN_investigates_secret_911_doomsday_plane_0913.html