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 (discussed here on Wikipedia), a specially modified Boeing 747 with a communications pod behind the cockpit.
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