airlines in sioux city. they were only able to change direction by one engines against the other. they had extra pilots who were dead heading and they saved that flight by doing that. this is starting to sound like a controllability issue, a steering issue based on the most recent information that you put up. >> peter, do you agree? >> i think, yeah, at this point the two accidents mary mentioned are really extraordinary events but, you know every accident is so rare these days that they tend to be one off. geez we haven't seen that before. this is pretty mysterious. you wonder whether there was something in flight that developed on a gradual basis and quickly overcame the pilots. there is a question if they had an issue why they didn't divert earlier. these are all questions that are going to be answered in the next week or ten days.