problem like smoke in the cockpit if you had an electrical fire in the avionics bay or something like that, he would have turned to the nearest airport which would have made sense. under that hypothesis if they became incapacitated or if there was a flight control problem. if there was a flight control problem, they still would have had the radio, so it's hard to figure out. what really doesn't make sense on that, though, was if they did become incapacitated and the airplane was flying along, it would normally continue in the direction it was going because it would have been programmed either in the flight management computer or just in heading hold mode to track that heading. so the fact that it appears that it turned either to the north or to the south doesn't really jive with that theory. there is still the idea of a hijack of some sort, either an intruder or the crew. you know, that's sort of where we are. we're looking for enough data to make a reasonable conclusion.