MEXICO CITY (AP) –  Passengers on a commercial flight in Mexico were given a start when a serpent slithered into the cabin in a scene straight out of the Hollywood thriller "Snakes on a Plane." The green reptile appeared suddenly on an Aeromexico flight from Torreon in the country's north to Mexico City on Sunday, emerging from the ceiling behind an overhead luggage compartment. Cellphone video shot by passenger Indalecio Medina showed it wriggling briefly as if trapped before partially dropping down into the cabin. "I was reading a magazine and the passenger next to me saw it and, 'Oh my word!'" Medina told The Associated Press by phone Monday. He estimated it was over 3 feet (about 1 meter) ...