while the plane was in the air? >> well, for accidents that happen while the aircraft is in the air, you can count them on the fingers of your hands. recent ones. everything from rapid decompression to fire to some kind of -- and we don't expect this here because of the controlled descent and the air speed maintained but some kind of an engine problem where you have an engine failure, you lose your air speed from your engines for some reason. it can happen for a lot of things. it can happen with icing. it can happen with hail. it can happen -- there's no birds at that height. it could happen with a lot of things but that's about it. and it could happen with some sort of an on board experience with the plane itself where you would have some sort of a breach in the fuselage. that would be a rapid decompression. but it's very rare. that's why for example when we did the extensive coverage on mh-370 we talked about the