Maybe it was one of those freak accidents like the tail fin shearing off, sending the plane down into the ocean.
They’d have been able to send a signal before it hit the water if that had happened.
I wonder about the reports we’ve heard about the plane being off course. How could a pilot not say anything, if the pilot went off course? That would still point to terrorism, meaning maybe someone else had control of the cockpit. I know the copilot was young...