Malaysia Airlines believes the co-pilot aboard the missing plane spoke the last words to ground controllers.
Malaysia Airlines CEO Ahmad Jauhari Yahya said at a news conference Monday that initial investigations indicate that co-pilot is the one who calmly said, "All right, good night."
Officials previously have said that those words came at a point in the March 8 flight when one of the jetliner's data communications systems already had been switched off.
The timing of the last words has sharpened suspicions that one or both of the pilots may have been involved in the plane's disappearance.
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