off course, you can do it, but -- there's an alarm. there's no way that you're going to do that without somebody knowing your plane is going off course. chris? >> so good to have you there giving us a sense of what happens in the cockpit. we keep focusing on whether someone did something to turn off these transponders. how likely is it that not someone but some thing would cause the transponders to turn off in sequential order like that, one some 15 minutes after the other? how would that have worked? >> that is a very unlikely scenario. for the equipment to turn off systematically like that, especially the transponder. it draws about the least amount of electrical power of any system on this airplane. so it would stay on the longest. if there was an electrical