I've noticed the scenery (FT KLAS XP v1.2) has AI taxi routing that is very inefficient. The routings lead all the way up to the gate parking spots. This does not allow much room for AI aircraft to maneuver. The best way is to allow the AI aircraft to use the routes determined by the built-in AI taxi logic system. The dashed yellow lines shown in the 'After' images are the autogenerated routes that will be used by the AI aircraft to get to the main taxi routes.