It's not just the co-pilot. They also have cabin crew. Those would certainly start worrying if they don't see familiar landmarks (lights of cities below, at night,) and if the cockpit door remains locked, and even they cannot gain access (reportedly, the cabin crew can open the door, in case of fish poisoning,) and nobody enters, nobody leaves.
If all that happens and the cabin crew is alerted, I can't imagine that they have absolutely no way to communicate with the ground or, at least, send a distress signal. It only takes one button and two wires... does Boeing have that?
Another nail into the container of this idea is the theory that when husbands are upset about their wives or their families, and when they are willing to inflict violence onto someone, very rarely they choose to leave the "guilty" alone and instead kill a bunch of strangers. I would rather expect the husband to go postal on his wife. Killing the passengers makes no sense whatsoever, from any point of view.
One can say, of course, that the man was insane. But then we throw all the logic out of the window; we can also say that the airplane was swallowed by the antipode of the Bermuda Triangle and transported a few billion years back. Such a theory would be equally sound (such as a pure guess, with no facts to support it.)
I don’t think we’ll ever know what transpired. Here was a highly respected, and well-liked, very experienced pilot. His wife was stunningly beautiful, with a couple of lovely kids,,,,, and he was fooling with another woman? I guess he might have just snapped as his life fell apart around him. Who knows? Who will ever know?
Since the pilot was Muslim I doubt his wife was stupid enough to leave him the day before he flew out.
She would have left while he was gone or risk being punished per sharia law. IDK but this whole thing doesn’t ring true.
Fish poisoning?