to geoffry thomas in perth now.ister abbott told the "wall street journal" that authorities would need to regroup and rethink their entire approach if they exhaust their leads this week and the bluefin fails to locate mh-370 under water. what are they saying would happen next? >> i'm more guided by air chief marshall angus houston who cautioned us last week that this could be a long search. it will take us two months, approximately, to actually search the area of interest. so, i think three days in though underwater search, i think we should be guided by angus houston. a very measured, cautious man. he's done this before. we're only on mission number three for bluefin-21. i think we have a little way to go before we start to look at plan "b." >> he has been very calm and direct and doesn't overhype anything. paul, is the reality that sonar is pretty much the only useful tool at this stage in the investigation? >> well, i think so. it's also the safest. as some of you, the other panel has already said, why risk someo

back to perth with geoffry thomas, and robert the editor of flying magazine. richard quest is back with me here in new york. geoffry, to you first, you see some parallels between what is happening with mh-370 and the successful search for air france 447. explain that to us. >> yes, indeed, don. with the search for 447, when they finally triangulated where they believed the wreckage was, they put down a bluefin-21 to have a look. it took them actually eight days, even though they knew virtually precisely where the plane was, it still took them eight days to find it. the wreckage on the bottom was confined to a small area, as well. we're in day four, four and a half in to this search on the bottom. we have a long ways to go yet before we sort of really completed a thorough search of the area where the pings have come from. don't forget, we have had four very strong pings. we had two fade out pings. according to one of the greatest wreck hunters of the world, david burns, he says we've found it. he's very, very confident that they are looking in the right spot. th

. >> geoffry thomas, thank you. coming up.d states often accused by critics for being the quote, unquote, world police. but if the u.s. can do more, should we step in? >>> later, you would not believe what has been floating around the ocean and how this could affect the search for flight 370. we'll be right back. ♪ [ male announcer ] when fixed income experts... ♪ ...work with equity experts... ♪ ...who work with regional experts... ♪ ...who work with portfolio management experts, that's when expertise happens. mfs. because there is no expertise without collaboration. (agent) i understand. (dad) we've never sold a house before. (agent) i'll walk you guys through every step. (dad) so if we sell, do you think we can swing it? (agent) i have the numbers right here and based on the comps that i've found, the timing is perfect. ...there's a lot of buyers for a house like yours. (dad) that's good to know. (mom) i'm so excited. he thought it was the endn for his dof the conversation.d... she didn't tell him that her college expenses

. >> geoffry thomas, thank you. coming up.he united states often accused by critics for being the quote, unquote, world police. but if the u.s. can do more, should we step in? >>> later, you would not believe what has been floating around the ocean and how this could affect the search for flight 370. we'll be right back. so ally bank really has no hidden fees on savings accounts? that's right, no hidden fees. it's just that i'm worried about, you know, "hidden things." ok, why's that? well uhhh... surprise!!! um... well, it's true. at ally there are no hidden fees. not one. that's nice. no hidden fees, no worries. ally bank. your money needs an ally. suddenly you're a mouthbreather. well, put on a breathe right strip and instantly open your nose up to 38% more than cold medicines alone. so you can breathe and sleep. shut your mouth and sleep right. breathe right. this is the first power plant in the country to combine solar and natural gas at the same location. during the day, we generate as much electricity as we can using so