April 7th, 2014
09:24 PM ET

Searchers race to verify pings heard by locator

It's been called the most promising lead yet - pings that are consistent with both the plane's flight data recorder and cockpit voice recorder.

But now, Commander William Marks of the U.S. 7th Fleet says “as the hours pass, our optimism is fading away ever so slightly.”

He tells Erin Burnett why.

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