Because of the X-48B’s efficient aerodynamics, Boeing and NASA researchers believe that the BWB (Blended Wing Body) configuration offers the potential for reduced fuel burn over conventional similar-sized tube-and-wing transports flying the same mission. In large part because of the way the engines are integrated into the vehicle - on top of instead of underneath of the wings - the BWB (Blended Wing Body) concept offers the potential to be quieter, as well. The X-48C is a follow-on project to the X-48B and is an evolution of the original BWB (Blended Wing Body) concept intended to incorporate and test emerging lower-noise technologies. The X-48C designation was an important milestone for the project, as X-plane status is selectively granted by the Air Force based on relevance to its vision of worthwhile flight research.