3 1 Introduction Thank you for purchasing the NEO add-on to the ToLiss Airbus A321. This add-on will provide you with the following additional functionality on top of the basic A321 package: • Choice of two additional engine options, including external 3d models, engine specific sounds, adapted thrust and fuel burn performance as well as engine-specific functionality such as the “Dual Cooling” function for the Pratt and Whitney engines • Fuel configurations and weight envelopes for the A321NEO,