When do people forget about 9-11? When does it lose its importance? I think the answers vary according to whether you're talking about society in general or people as individuals. For me, I will always remember what I was doing, who I was with, the weather on that day, waiting to hear where the closest blood donation site would be set up, realizing none of us had an emergency plan for contacting relatives -- because what would ever happen to make that necessary?
The eeriest part of my day was when I went to a meeting on campus for some last-minute planning for a conference just a week away. The bright blue sky, very few clouds and absolutely no air traffic. Knowing that if I did hear an airplane, most likely something really bad was about to happen and there was nothing I could do about it.
I think 9-11 is our generation's Pearl Harbor. It was awful but we lived through it. And we never want it to happen again.