Still going with my theory that the pilot/co-pilot was paid off to hijack the plane. Why exactly I'm not sure, potentially something aboard worth a lot of money and hassle to someone. Probably killing the passengers through depressurisation. This could have gone wrong somehow and the plane could have crashed in a currently unknown location at sea off course.
Looking more and more likely that it wasn't simply a malfunction.
Looking more and more likely that it wasn't simply a malfunction.