And i would imagine if, according to reports, the pilot of the plane traveling behind reported seeing fuel leaking. how was this not caught ahead of time? >> certainly that would have been something you would catch. what you have to think about is on those walk arounds, it's not like they are opening up the engine and even if they did open it up and looked at all the fans and connections, there might have been a fine looking connection which gave way when they tried to start the engine, which is what would have been happening while taxiing. normally you start with one engine going and fire up ...