Malaysia plane hunt focuses on report of a signal

Aviation expert Richard Aboulafia of the Teal Group in Fairfax, Va., called it “potentially good news” but warned that, even if the flight data recorder and cockpit data recorder are found, they might not contain all the information needed to unravel the mystery. The cockpit recorder, for example, keeps only the last two hours of audio, which “could be two hours of silence,” he said.