and days to come or fall apart as we cautioned? if this is not an accident but an act of terrorism or some kind, a deliberate act, it's worth noting no one appears to have tried to take credit for it. on the other hand, we looked at this today and found most acts of terrorism do go completely unclaimed. we have seen credible claims for just 14% of all terrorist acts since 1998. a lot of them start as mysteries and confoundingly, frustratingly, they stay mysteries. >> whatever the outcome of this mystery, the disappearance of malaysia airlines flight 370 entered their second week with investigators hoping they'll get enough information to narrow this seemingly infinite search. a senior u.s. official told "the new york times" today investigators expect to get more satellite and radar data over the weekend. "it's gotten better and better every day. it should provide more clarity to the flight path. it's not a given, but it's a hope." joining us now is jim tillmon,