we don't know that right now. this opens up the possibility, the possibility once again of catastrophic failure. 1:19 the pilot says -- the co-pilot says "all right, good night." two minutes later, everything goes haywire. he's in a situation trying to control the aircraft. we know it was going up or down. we know right then they tried to turn back. the transponder went back. acars never transmitted again. it's a different scenario, we're back to looking at catastrophic failure. the one problem with that, anderson, how does a plane that has a catastrophic failure go on to fly seven more hours? there's also a window for the hijack theory but a very narrow one. this is going to be something debated all day today and well into the future. anderson. >> jim, thanks very much. and it could be mechanical failure, not something catastrophic, not suddenly ingt u.s. as the plane did continue to fly. it could be something pilots were battling. we've got experts in every aspect of this. david gallo who co-led the