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Couple under the radar, they did have a six-month-old daughter who's currently in child protective custody. and now for the latest on the investigation, i'm joined by nbc's blake mccoy, again standing right where the fbi local official was yesterday, and we heard then from james comey about what the national fbi is doing, what can you tell us? >> it was here that that handoff occurred from local authorities to federal authorities now that the fbi has taken over. we know hundreds of fbi agents overseas and here at home are working on this investigation. the one s overseas are looking into the...

That we are at now, if we want to find the aircraft, we're going to have to find some wreckage on the surface to give us an idea of -- at least a general idea of where it is. it is enormously difficult, even with air france, where we knew what track they were on coming across the atlantic. it still took two weeks to find out where it was. >> other investigators have said that it would be helpful if we had more information about the conversation between air traffic controllers and these pilots, not only from this flight but from past flights. but if they had anything pertinent, wouldn't that ha...

. >> we have information on the jet component of the search. barbara at the pentagon, how much is this costing? >> the pentagon calculated it so far on the search since the plane went down, the u.s. military spent $2.5 million and they budgeted $4 million for it. they think that will carry them through early april in case it laughs that long. this is always a very tough issue. forces are training all the time. it's hard to calculate in terms of what they wouldn't already be doing. -it is a sensitive issue because

Have some answers about that plane. cnn's laurie segall, has more for you. >> hey, carol, right now, the plane sinks to the bottom of the ocean. the flight data recorder goes with it. we spoke with one company that says, that doesn't have to be the case and to say we could have had a lot more answers about the missing jet. >> when malaysian flight 370 disappears, the story of what went wrong vanished with it. the answers might be stuck in the flight data recorder, the so-called black box but what if we had those answers all along. >> we would know where the aircraft has gone and where it is an...

And they're done searching from the air for the day. cnn's andrew stevens is in perth, australia, the hub of the crew. andrew, the weather was good today. we were hoping for something. >> reporter: that's right, carol. the weather was better than good, it was excellent. visibility really, really good out over that search zone, but the five aircraft who came out there all came back empty handed. not a sighting of anything resembling a piece of debris which fits what we know about those two objects lying in the water somewhere in that zone. a very disappointing day. the pilots themselves express...