On United 93 during 9/11, once the passengers became suspicious they immediately went to their cellphones. No one received a call from this plane. It leads me to believe the pilots were turning back to land because of some sort of emergency, smoke in the cockpit, a cargo of batteries smoking, a blown tire on takeoff burning, something along those lines. After the crew made the turn, the smoke rendered everyone unconscious similar to golfer Payne Stewart's 1999 flight. Once they turned to the new heading the plane continued on that course on autopilot until it ran out of gas.
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