new book. this appears to be operator error from the air traffic controller who was in training. he had someone with him. how does that work if a trainee makes a mistake? >> it's still on the onus of the trainer to correct it and it's still his responsibility ultimately. the trainee is not going to suffer discipline consequences. in that sense, if you're looking at that, that is what is going to happen. in this situation, there is always going to be human involvement and when the human involvement occurs, there's always going to be a chance of mistake. the beautiful thing about it all, though, is we have so many back-up plans to this. we have other pilots, other systems and like in chicago o'hare, for instance, we have a local monitor position where someone actually plugs in and monitors the position if it's a crossing runway situation. my guess is after something like this they may be doing something