delta or american or united, they've got to think first of all we've got to put it on the aircraft it costs a couple of million dollars, you write it off as a capital cost. but then you've got do run the system. have you got enough bandwidth on satellites? what do you do with all this information? so it's a question of getting the right form l.a. now are they moving fast enough to come up with a solution? no. is probably the answer. >> david gallo, a question from somebody on twitter. who is responsible. specifically about the weather. in terms of avoiding the thunderstorm. is the pilot responsible for avoiding the thunderstorm? or is that something that air traffic control is responsible for? it does appear as though weather was a very big factor here. >> right. and i've heard several times now by other analysts saying that it's the pilot has the primary responsibility for the safety of his passengers. and then he can rely on air traffic control to help him out. but that's initially the pilot's responsibility to do what he can to save himself and those