Investigators have learned a lot from previous air disasters. If Flight 370 crashed into the water, there would be certain clues that could help locate the wreckage. Pamela Brown reports on what searchers are looking for.
Anderson spoke with David Gallo, who co-led the search for Air France Flight 447. He compared today's expansion of the search area for Flight 370 to looking for something off the coast of New Jersey and then finding out it's off the coast of Oregon.
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