I worked in the SF Bay Area where flight 93 was headed. Our company had a lab in NJ and had people commuting throughNewark all the time.One guy would book fights for the evening and the next morning, and then put the unused tickets toward future flights. Back then, electronic tickets were not in existence and you had the ones printed out by travel agents. This guy had flown back on 9/10. As the events unfolded, he came out of his office ay about Noon with a shocked look on his face. He avowed us a ticket for United Flight 93 for the morning of 9/11. If he had worked later on the 10th, he would have been on that flight.