29-year-old. >> i tend to believe they were not. i believe the hijackers was more serious and purpleful meeting of individuals who purely wanted to wreak violence on society. >> reporter: so in some sense he was facilitating? >> believe that is true. >> reporter: months later, in a twist of fate. 31-year-old army officer nadal hassan attended. from time to time he go is to services bus it's unknown whether he ever met anwar al-awlaki in person. >> on the fateful day in september, pentagon, washington and field in thanksfield pennsylvania is hit. aboard flight 77 washington dulles, three of them, hosni and