Kid, the thing that none of the documentaries will show you was how that morning, after the first reports, nobody knew anything.
CNN had reported about a fire on the National Mall, which turned out to be people seeing smoke from the Pentagon and not understanding what they were seeing. There were rumors of a car bomb at the State Department building, a bomb at the U.S. Capitol building, and one at the Old Executive Office Building next to the White House. “The USA Today building in Rosslyn was supposedly enveloped in smoke,” per one report. You name the Washington landmark, chances were somebody had heard it had been hit.