we know the mechanics of it. the question of why is what is so hard to understand. cnn, las vegas. thank you so much. i want to talk more about this cockpit. we do have this photo. this is the actual cockpit from this germanwings flight 95 a 25 taken by the airplane enthuse enthuseist. this is a plane he was on before it crashed. back with me commercial pilot and federal prosecutor of fatal jet incidents. christina, first to you. a lot of people are tweeting us questions. one is why didn t germanwings have this two person cockpit rule which by the way that changed today? that s right. there are a lot that had this protocol before today. one reason is there s no requirement under safety procedures to have this protocol