Just yesterday. joining mess is jay rollins, a retired american alliance cappon and former u.s. navy pilot. on skype debra hersman, president and ceo of the national safety council, the former chair of the national transportation safety board, and bob hagel, who has covered aviation for nbc news for 25 years. thank you all for being here. bob, let me go to you first. you have reported on a lot of airline disasters. what similar are there to other crashes in this? immediately i think of flights where there s been some problem at full altitude like this one. that is so unusual, as you said but air france just a few years ago over the atlantic when it was a failure of the navigation equipment. twa 800 over long island.