We turned on the Company TV, just in time to watch the jet hit the second tower. At that point, it was obvious that this was NOT an accident. I was reporting just that to the company President when a jet flew by, far closer than normal. About thirty seconds later, we heard a loud explosion and felt the building shake a little. (We were about 3-4 miles up from the Pentagon.) Then the TV broke the news that a plane had hit the Pentagon. 10 minutes later, we closed the offices: I started a fresh backup of our data, and took the last three consecutive backup sets home with me that night.
I also have a friend who lived on the hill overlooking the Pentagon, somehow, I got through to him at his office at the Patent Office, and offered him an Evac out of the area, not knowing what would happen. Mistake on my part. 7 hours later, after fighting traffic on a scale DC had never seen before, or since, I got him, his cat, and 6 random GI's out of the Pentagon area, dropped the GI's off at a commuter parking lot in Woodbridge, Virginia, and got home, to a TOTALLY hysterical wife (cell phones were pretty much useless after about 10AM in DC. . . ).
The ride out was memorable: with the exception of my pal, everyone in the car was either military or ex-military, and we all KNEW that a war had just begun. . . .