>> the hijackers walked into our country legally. the '98 entry to the u.s. from canada was anything but legal. >> he presents his yemeni passport as proof of citizenship. shortly after receiving his u.s. visa, he travels to san diego. within a week he's filed application for asylum claiming to be a citizen of somalia fleeing persecution. he entered the united states he says through new york, utilizing a fraudulent italian passport. under the name frank depolo. >> frank the chicken? >> right in a four month time period. >> he took them to the college. a flight pat has been a fright instructor for 26 years. >> why do you believe that plane is the plan they flew? >> in was the only cessna we had. >> what was it like to realize that you had been flying in the same plan the hijackers