selflessness of the heros of flight 93. [ bell chiming ] >> the ceremonies marked 16 years since the attacks that killed nearly 3,000 people and changed the world forever. the first commercial jet slammed into the north tower at 8:46 that morning. a few minutes later, a second jet slammed into the south tower. then a third jet crashed into the western portion here of the pentagon. news of these things reached the passengers on united flight 93. that flight had been westbound and hijacked, but the people on board fought back, and that many went straight down into the ground in shanksville, pennsylvania. i'm joined by a man who you know from my show but he knows that