A passenger onboard a Frontier Airlines flight from Puerto Rico to Chicago was arrested after he allegedly choked an off-duty employee. Police also allege the suspect tried to open the emergency exit doors of the plane and attempted to enter the cockpit during the disturbance on the flight, which was headed to Chicago on Sunday. According to the FAA, the flight made an emergency landing in Miami, and the passenger was taken into federal custody. Frontier Airlines confirmed the flight then made the rest of the trip to Chicago without further incident. A criminal complaint obtained by NBC News alleges the 51-year-old suspect had told flight attendants he wanted to get off the plane, then tried to open the rear exit door of the plane. #flight #frontierairlines #chicago #ohare