<p>Early flight data showed the K2 Airways plane with five crew on board possibly crashed into the sea southwest of Karachi</p><p>A Pakistan-registered Boeing 737 cargo plane with five crew members on board lost contact with air traffic control on Tuesday night after reporting a navigational system problem on its way to Karachi, Pakistan aviation authorities said.</p><p>Early flight data indicated the 27-year-old converted freighter operated by K2 Airways from Sharjah in the United A