The wing was changed again. Many different changes were made. An example of one is a bigger wingspan (made bigger by ). Since the wings were made bigger, 30% more fuel could fit in the plane. CFM56-7B engines were used, which were newer, quieter and burned less fuel. The improvements to the wing, engine and fuel mean that the 737NG can travel 900 nautical miles further. This means it can travel over in total, which means that the 737NG can travel between different continents. Winglets can be added to most 737NG models. The flight deck was given modern electronics (called avionics). The main cabin was also improved.