steve ascent and then the plane stalled, does that make sense to you? >> well it does in some respects. look there are two thing -- there are several things that can cause an aircraft to go up at a very rapid rate of climb. one is pilot-induced, pulling the nose up. although it's very difficult to maintain any high rate of climb at high altitude because the aircraft performance is insufficient to maintain a high rate of cliep. you could get an initial high rate but then it would drop off as the aircraft stalls. the other way is an updraft in the thunderstorm. if there's a very strong updraft, the aircraft could in theory climb at great rate. but you know which ever way you look it, ku i do not -- there's only so much power from those engines so unless you've got forward air speed, you do not have control of the aircraft and it will stall. >> alistair rosenschein, thank you so much for joining me once again. i sure appreciate it. still to come in the newsroom, she knew the risk but loved to fly. the family of a crew member on