CNN: Mystery 9/11 aircraft was military 'doomsday plane'

September 13, 2007
CNN: 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.

CNN has now learned from two government sources that the mystery plane was a military aircraft and has determined that the blurry image on video appears to match photos of the Air Force's E-4B, a specially modified Boeing 747 with a communications pod behind the cockpit.