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During flight. >> now that they have this, is there any reverse engineering that can go on? how helpful is it that it's 2300 miles away from where they're looking? >> the reverse engineering as far as the drift patterns, i don't think there could be anything conclusively derived from where it's located. there were two major, major storms in this period of time that went through this area and could have disrupted even what you would think of as the currents and because it's floating as well, even the wind currents can change the direction of the drift, which we may or may not have real specific...

Explain to everybody exactly what the component number is, why it's so central to determining whether the fragment is that from mh-370. >> well, the boeing company and probably the airline know exactly what the numbers are. >> uh-huh. >> in the aircraft. so that will not be the question. but i think that -- i think people are being a little overoptimistic about what this means. >> how do you mean? overoptimistic that it's actually going to lead to a larger section of the plane, the black box the cockpit voice recorder? >> yes. if -- people should remember that the air france flight going from ...

The indian ocean is a bit like a washing machine. it has this counter clockwise current. it has currents also going east and west. so it's a complicated matter to sort out how pieces of wreck saj would move. based on where this piece turned up if indeed this is part of mh-370 working backwards, that means the place on the ocean bed where they are saeshlging is probably the right spot. it is a huge area. they've already searched an area half the size of pennsylvania. they're continuing with these towed sonars. they think they're in the right place and they do believe that they can find the wrec...

Safety analyst david souci a former faa accident investigators. justin, you're here with us in studio. it has a number, a component number, they say that corresponds to a boeing 777. if it is a part from a 777, almost has to be from mh-370, yes? >> that's absolutely correct. after i left you this morning, i spent the morning talking to the families who i represent from the crash and what they want to know is 100%accuracy. that's what they're waiting on. >> after all of the raising of hopes and dashing of hopes they've gone through, i think that's absolutely understandable. david, on this break...

Talking to your sources who brought this information about this component number. what does this mean, this high level of confidence? >> reporter: well, kate and john, you definitely get the sense that investigators' confidence is rising. i want to just kind of set the full picture here. yesterday a source close to the investigation told me that based on the photos that boeing engineers had been looking at, based on the appearance and their knowledge of the eunique elements and design of a boeing 777's wing and components of the wing, their initial assess am was this appeared to be a part of a...