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Sleep. but my scenario is a smoul smouldering fire that created smoke and once that began the crew donned their oxygen masks. you can't totally see all of that smoke from breathing and you're going to get toxic fumes, depending on what is burning. so my scenario is they approached that point where it sounded like there was a normal situation. there may have been something on the screen that indicated a slight fault, maybe a shrug of the shoulder and then it started to progress if it was a fire situation. the captain realized it was compelling enough to get the airplane turned and entered a way...

Investigators start eliminating them? and with all of the technology in this world, why is it that planes don't have an unstoppable tracking device attached? we're going to begin with a big development tonight. reports that flight 370's abrupt turn to the left was programmed into the onboard computer at least 12 minutes before the co-pilot's famous final words "all right, good night." cnn's jim sciutto and richard quest are both here. the plane's program was changed at least 12 minutes before. what does that tell you? >> at least 12 minutes before. what it tells me is that when that reprogramm...

Regular route flight that trip would be saved in the flight management computer as a code and then they fly that trip every time they fly that flight. >> mm-hmm. and same reckoning of this? because i'm trying to give every benefit of the doubt to the pilots that we can until the facts dictate otherwise. this does line up like a bad fact. this isn't routinely and not ne people? >> i don't see any reason they would do that unless they had -- perhaps a specific reason, they had to have an alternate, they were running low on fuel, something like that, then they might say, look, i want to have this...

Malaysian airport. what do you make through that, les? >> to me it's one of the more plausible scenarios. i'm not sold on that scenario. but up until the point we got this information which i'm still skeptical about the 12 minutes prior, it seemed to me that having a smokization, getting beyond that last verbal communication with air traffic control, it seems to me that if the crew was trying to handle an emergency, realized they had an emergency what would happen in my cockpit would be i'd say avenue got the airplane. and then the copilot would begin the checklist process. since i have the ai...

>> absolutely. because what you now have is a direct contradiction in terms of all of the theories. they can't all be right. but if the preprogrammed 12 minutes earlier fact is right, then the mechanical turn around theory cannot be right as well because that preprogram -- and what i now believe is that that preprogram may not have actually happened when it was done in the flight management computer but may have been when the plane next reported in at 1:07 because when you report in, automatically your next waypoint and your next waypoint are sent along with it. >> and what i'm understanding f...