in this case it would be a may day call. when he makes a may day call priority would be given to him. unfortunately, as we all know there was no may day call. so i'm not sure how it all happened. there should be a distress call but unfortunately there was none. >> you were a long time pilot. you also teach. you teach people how to fly 777s. there was no distress call. preliminary findings say the plane may or may not have turned around and then the plane disappeared. in your mind what scenario -- i mean how can that happen? >> it's not clear. please repeat your question. >> i know that you teach people to fly the 777. is there any scenario that you can think of similar to what