No semantics. Just the truth.
At 9:25 a.m., the control tower at Dulles airport observed an unidentified vehicle speeding towards the restricted airspace that surrounds the capital. [Washington Post, 12 September, 2001] The craft was heading toward the White House. "All of a sudden, the plane turned away. ...This must be a fighter. This must be one of our guys sent in, scrambled to patrol our capital and to protect our president... We lost radar contact with that aircraft. And we waited. ... And then the Washington National controllers came over our speakers in our room and said, "Dulles, hold all of our inbound traffic. The Pentagon's been hit." [Danielle O'Brien, ABC News, 24 October 2001]
That is your official story. You have nothing else. You could look for eye witnesses like CIT but you probably don't want to do that.