Our company was located in Alameda, CA and we had a place in NJ that several people would travel to regularly. One guy would get tickets for several days, use one and get refunds for the rest if he had to come back earlier or later than scheduled. At about noon on 9/11, when we were watching the news in the lunchroom, he came in and showed us something. He had flown back on the evening of 9/10 and had a boarding pass for flight 93 (the one that crashed in PA). If he had not finished early and come back the night before, he would have been on that plane.