The Boeing 737 MAX uses 37% less fuel per trip compared to the Boeing 757-200, which currently makes up the bulk of the Icelandair fleet, and 14% less than the Boeing 737 NG type of aircraft. The 737 MAX also leaves a 40% smaller noise footprint than its predecessors, even though the engines are more powerful. This is due, both to a new aerodynamic design of the body and wings (notably spilt tip winglets) and an innovative design of the engines.
The engine blades are made of super strong carbon, woven together with a 3D-technique. This means each engine is over 500 lbs lighter than before, saving fuel and creating less pollution.