I was working line service in MHT. Went to fuel the 9am NWA Airbus flight, and they said to hold off, they may not be departing. Saw what was transpiring on the TV in ops, and went back to the FBO. Got there not long after the second airplane hit, and after the second tower collapse they sent us all home. Didn't go back to the airport for at least 3 or 4 days. I was going to night school at the time, and they didn't cancel classes for some reason. I remember sitting down in class, and wondering WTF we were all doing there. I got up and left. When I got in my car Opie and Anthony were just finishing up their show, and they played "Don't Tread On Me" by Metallica. That song will forever be associated with 9/11 in my mind.