After four weeks of pursing false leads including ordinary flotsam, Australian authorities say they've detected the "most promising lead" yet in the search for the missing Malaysian airliner.
Three separate but fleeting sounds from deep in the Indian Ocean offered new hope Sunday in the hunt for the missing Malaysia Airlines jet, as officials rushed to determine whether they were signals from the plane's black boxes before their beacons fall silent.
Ever since Malaysia Airlines Flight 370 disappeared, a fascinated public has asked: Why can somebody in the cockpit shut off the transponder?
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