The media is saturated with 10th anniversary 9/11 stuff right now and it is hard to make your way through it just to find one genuine piece of journalism. However, this morning I went to nytimes.com and they had posted, and made available to listen to, a bunch of transmissions from 9/11 as it happened. I listened to the first one and I was riveted by what I heard. I stayed in my seat until the last tape was done, the one in which the order is given to shoot down any planes if they are not responding to directions, but by that time, as we know, all four planes had crashed.
The tapes are worth a listen.