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Slowly, one to four knots, and it simply cannot search hundreds of mile area like it is right now. so we still need to keep flying. we still need to get a visual confirmation on the debris, let our oceanographers work backward and get that datum so we have a good central point. the black box only has a range of maybe a mile or so. so it's not like it's pinging out this very strong signal. you have to be close to get a hit on it. >> commander marks, appreciate all you're doing and talking to us. >> cnn safety analyst david soucie author of "why planes crash" cnn aviation analyst and veteran pri...

China has an army of sensors filtering information. this is the first time a u.s. first lady has traveled to china without a president. only the third time mrs. obama made an overseas trip since they moved to the white house. she and her daughters will head to the great wall tomorrow. it took almost two years to find the debris from air france flight 477 after it crashed into the atlantic ocean in 2009. it took cameras, computers and advanced technology to search the depths of the ocean. we're in new york with an up close and personal look at the equipment that could be potentially used to f...

Apparently there are other bits and pieces, the detail of which is still very sketchy. and if this is the airplane -- and we have to qualify that -- if this is the airplane then it does not look like a very good outcome. and one senses that it hit the ocean and disintegrated on impact. which is what happened with air france 477. >> geoffrey, do you believe -- you're on the ground there in australia and know the scene better than anyone -- do you think authorities in australia have more information than they have publicly shared? because it was surprising that the australian prime minister came...

And we have to qualify that -- if this is the airplane then it does not look like a very good outcome. and one senses that it hit the ocean and disintegrated on impact. which is what happened with air france 477. >> geoffrey, do you believe -- you're on the ground there in australia and know the scene better than anyone -- do you think authorities in australia have more information than they have publicly shared? because it was surprising that the australian prime minister came out and announced the finding himself. >> look indeed, anderson, i think that's spot on the mark. i believe that the ...

The search for the missing airplane is drawing comparisons to air flight 477. it took two years for investigators to find the wreckage on the floor of the atlantic ocean. relatives of the victims of that flight are reaching out to family members of flight 370. cnn samuel berk joins us from new york to tell us that story. >> it is actually german family members of victim frs thom that crash in 2009, taken to a facebook page where the families of different victims use in these type of situations. they have posted an open letter to the families of the malaysian victims. they say in this letter th...