story. brian? >> tonight, safety experts are calling for cameras to be installed in cockpits. a mechanical eye inside the cockpit they say could deter pilots from reckless behavior capture any potential threats and help investigators after a crash. a key question tonight, could a camera have made any difference in the germanwings crash? andreas lubitz had locked himself alone in the cockpit as the captain pounded on the door. tonight, safety experts are calling for a bold move to avoid another disaster. cameras in the cockpit. >> the cameras would not be on the face of either of the pilot or the co-pilot. they would focus on the instruments and on the manipulations that are made. >> reporter: former ntsb chairman jim hall says cameras in the cockpit would be a deterrent to bad behavior and careless piloting and would be a key investigative tool. what could cameras trained on the control panel detect? >> you could see the instruments, what they are seeing on their instrument