more now on the cockpit door of germanwings airlines 9525 that was so well designed to keep the pilot from regaining access on it that kept him from regaining taking control of the plane. and now, we look at what might have sparked this incident. some background from randi kaye. >> reporter: value jet flight 592 from miami to atlanta, the day before mother's day, 1996. the pilots hear a loud boom, six minutes into the flight. >> what kind of problem are you having? >> smoke in the cabin. >> reporter: the aircraft crashes nose first into the floored everglades killing all 110 people on board. the ntsb determined the fire began in a cargo compartment. >> if we had fire detection