I just read online The BBC had an expert a few days ago that shared his view, and i think he will turn out to be the most accurate. He thought the plane had major faults causing the pilots to turn the plane around, however, upon doing so the plane de-pressurised causing oxygen levels to plummet and since the plane wasn't working properly, oxygen masks will not have fallen nor will anyone have noticed, instead, everyone would have passed out into unconsciousness within a minute and died within 15 minutes. The plane will have already gone into auto-pilot and there'd be enough fuel for 5 hours or so after which it would have run out and gone down and crashed into the Indian Ocean. That's literally what this expert said a few days ago, and today it seems other experts are saying the plane did ping signals for another 5 hours or so and the US is moving to search the Indian Ocean. These outrageous stories are to try to get website hits and newspaper sales, the truth is far easier to understand & depressing.