Whatever happened to Malaysian Airlines flight MH370 was not accidental. That begins to emerge as we learn that the plane's radios were shut down in flight. See an ABC News story with details.
It appears the pilots, or whoever was in charge, did not know that the engines were sending signals to a satellite overhead. These went on for several hours before finally ending.
Thinking also has the plane heading west, toward Sri Lanka and India instead of east over Vietnam toward China, the flight's intended destination. Knowing only what is in the news, I lean to the opinion that the plane was hijacked.
Whether it was then crashed into the ocean or landed at some clandestine strip isn't known at this point. For all of us who spend more time than we'd like as air passengers, the story holds deeply morbid interest.