investigation. >> the ntsb has the greatest reputation for what may be a catastrophic event. we have a team of four people that are now on the ground in kuala lumpur. they're going to access the final contact with the aircraft as well as the maintenance records. it's odd and does suggest a sudden event. >> the really impressive thing to me, in 30 years of my experience, we've never had a time when the aircraft suddenly disappeared and we can't find it. that's very unusual. >> u.s. officials also insisting that this does appear it will be a long drawn out investigation, and that this is an area where there is a large amount of human smuggling and that can't be ruled out either, gretchen. >> interesting. thank you. how could two passengers board a flight with stolen passports post 911. it turns out it happens all the