Aus 9/11 Wiki
"We could not see the plane. The only thing that we saw was a piece of the front skin with the 'c' from American Airlines by the little heliport control tower. There was a fire truck there that was burnt on one side, and a car, and a tree, all burnt. But, still, you could not see the plane."
Is not a witness to the flightpath of the plane. Even shows incredulity that a plane "crashed" there.
Source List: Response