George W. Bush praised the 40 passengers and crew who fought back against their Flight 93 hijackers on 9/11 for carrying out what he described as one of the most courageous acts in U.S. history. He spoke at the Flight 93 memorial in Pennsylvania as events across the country began to mark the anniversary. Also attending the ceremony was Vice President Joe Biden and former President Bill Clinton. See more pics and get more details after the jump… @ItsLukieBaby