No trace of Malaysia Airlines Flight MH370 has been found since it vanished on March 8 with 239 people aboard. Investigators are increasingly convinced it was diverted perhaps thousands of miles off course by someone with deep knowledge of the Boeing 777-200ER and commercial navigation.
Suspicions of hijacking or sabotage hardened further after it was confirmed the last radio message from the cockpit - an informal "all right, good night" - was spoken after someone had begun disabling one of the plane's automatic tracking systems.
But police and a multi-national investigation team may never know for sure what happened in the cockpit unless they find the plane, and that in itself is a daunting challenge.
Satellite data suggests the plane could be anywhere in either of two vast corridors that arc through much of Asia: one stretching north from northern Thailand to Kazakhstan, the other south from Indonesia into the Indian Ocean west of Australia.
China, which has been vocal in its impatience with Malaysian efforts to find the plane, called on its smaller neighbor to "immediately" expand and clarify the scope of the search. About two-thirds of the passengers aboard MH370 were Chinese.
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