[CraigSca]

Originally Posted by JPhillips

From the Wall Street Journal:
U.S. investigators suspect that Malaysia Airlines Flight 370 stayed in the air for about four hours past the time it reached its last confirmed location, according to two people familiar with the details, raising the possibility that the plane could have flown on for hundreds of additional miles under conditions that remain murky.

To me, this sounds like a hijacking gone wrong. Not unlike Ethiopean Airlines Flight 961.

Ethiopian Airlines Flight 961 - Wikipedia, the free encyclopedia