done this without the other one realizing it? >> absolutely. during the preflight preparation on the ground, typically you'll have a pilot walk around the outside of the plane to do the preflight to make sure the plane is sound. a lot of the time, the other pilot will be in the cockpit doing cockpit duties to include building the flight management flight plan, so you'll have a guy by himself putting in the route. he could build a primary flight plan from kuala lumpur to beijing. >> without the knowledge of the other pilot that was checking out the plane. >> correct. we've also learned more about the pilots. >> each day, the mystery surrounding the pilot deepens. we now know he has two homes. why would a well off pilot hijack his own plane, friends ask? >> bright, intelligent, inquisitive. >> and a family man.