I'm two blocks from the White House, and I heard a military plane whizz by -- close and loud -- right around that time. My friend across the street at Bloomberg emailed to ask if I heard it too, and told me what was going on.
We were at code Red for a few minutes, folks.
The White House briefing was interesting -- with questions like, "haven't the terrorists won if one small Cessna can throw the whole government into chaos?"