sean mersnicky is here an air safety expert at ohio university. gentleman, good to have you with us. sean i'm curious, there have been some comparisons as well to air france flight that crashed five years ago. weather was to blame there. is that a fair comparison for us to make? i know it's early on in this stage of things. >> i think are you exactly right, there certainly are some similarities here t. concern is driving near the top of storm clouds as a pilot, we focus on icing, turbulence and hail are the three we focus the most on. there are some similarities here. it will be an interesting development in this accident. >> as we said early stages rich we know there has been some speculation and conversation surrounding the top, relying too heavily on auto pilot. we know after the investigation in san francisco, that was certainly a conversation.