I was in the 5th grade at that time. I can still see all the kids in the Cafeteria, gathered around the one TV in school, watching the live broadcast. Many kids were crying, and all were stunned by the horrific event!! frown It was a sad day for America, and I think still is!!
It is definitely one of the 3 or 4 most horrifying days in modern American history. Not sure how to rank them so I put them in chronological order.

Pearl Harbor
Invasion @ Normandy
John F. Kennedy assassination
9-11-2001 (World Trade Center Towers)
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It figures, I should have been here yesterday!!

Rick