I was sleeping late. My wife came and woke me up and said "the country's under attack, terrorists have blown up the World Trade Center and the Pentagon. You might want to get up."
As I got out of bed and sleepily walked to the TV in the living room I thought "Who would do this? Right wing nutters ?" BTW this was about two hours after the towers fell. When I saw the television images I just sat down and watched for about two hours. I remember thinking "why did it take them so long" because I first expected this in the 1980's, when Reagan was intervening in Lebanon and Nicaragua. I have often wondered why terrorists of different stripes have not been bolder in attacking USA targets and citizens, we have virtually no internal security, and still don't five years later. It's so easy for terrorists to strike here, it doesn't make sense there haven't been more attacks.
Anyway I had to go to the grocery store and bank and then teach for several hours, which I did, thinking that "if we react to this, let it disrupt our routine, they will have won." I thought about the people in the London Blitz, and went about my business. Of course, that's easy when the attacks are on the other side of the continent.
One of my best friends is a conductor for New Jersey Transit, the railway system that brings commuters into Manhattan Island from NJ. He had a very busy and never wracking day, concluding with helping to evacuate Penn Station after it had been shut down. He saw the second tower fall from NJ, before the train goes under the Hudson.
Another friend had a ticket for Flight 93 (the one that left Newark (?) ) but ended up on the next United flight to San Francisco (?) , don't remember why. This plane landed in Omaha and he got together with some other stranded people on the flight, they were able to rent a car after about a day and they drove back to the New York area. There were no non-military aircraft in US skies for several days after the attacks.
9/11 is the most significant world event to occur in my life time, so far. I think there will be another attack, probably worse than 9/11.