YouTube / CBS News A passenger on a Southwest Airlines flight threatened to kill the flight's passengers and crew on Saturday. The passenger had tampered with a bathroom smoke detector, and a flight attendant caught her smoking a cigarette, the airline told Business Insider. The passenger was arrested on a felony charge and sent to jail on $75,000 bail. A passenger on a Southwest Airlines flight from Portland to Sacramento threatened to kill everyone on the flight on Saturday after she was caught smoking a cigarette in the bathroom. A local Portland news outlet, KOIN 6, reports that the passenger, Valerie Curbelo, tampered the smoke detector in one of the plane's bathrooms and smoked.