I see reports of small planes and helicopters that fell out of the sky and they do not know what caused it. On the other hand, it is rare for a big passenger plane to fall out of the sky. I have a theory that The Devil is causing the engine to shut down or the pilot to lose control of the plane, just like The Devil is responsible for abducting and murdering people that go missing in remote areas or national parks. I do not have proof of this. It is just my theory.