My then-gf was already up and getting ready for workand had turned the news on. She came into the bedroom and woke me telling me, "You need to get up, there's something going on on the news." I just mumbled something and rolled over and went back to sleep. After she had left for work, my phone rang at about 8AM. I was a bit agitated that someone would call that early in the morning and was rather grumpy when I answered. On the other end was my National Guard unit's First Sergeant. The conversation went like this:
Me: (grumpy/sleepy voice) "Hello?"
1SG: "It's First Sergeant O. Pack your **** and stand by."
Me: "What's going on Top?"
1SG: "Turn on your 17ing TV, dumbass."
<Click> as he hangs up
GF had left the TV on, so I went into the den, sat down. By this time the first tower had fallen, and just as I called into work to tell them I was going to be late (if I showed at all) I watched the second tower come down. Later that day I watched the last few ships scrambling out of San Diego bay and I remember feeling angry because they were already in the fight.
On another personal level, the gf's best friend was a flight attendant for AA and her fiance was a pilot for AA. Both flew Logan to SFO regularly, along with gf's mother, who was an national exec for a major corporation. Fortunately, neither of the females were flying that day, and the pilot was in ATL and got grounded there.
ETA: One other thing popped into my mind while reading these. The then-gf's brother is an LAPD officer and was at that time assigned to Rampart Division (South Central LA). He told me that they didn't receive a single call that day.