Officials believe the most possible cause was an advanced suicide of the flight captain.
It’s just a theory,there are many others. After 4 months another plane of the same company had an accident. Some people weren’t and aren’t telling the truth and there are proofs of that
Scientists and experts are already very sure, that it was an advanced suicide. The pilot flew and knew a route which only experts could know how to disappear from GPS and radar. The probably position of the wreckage is on an oceanside where its Impossible to reach it.