Technologies on the 2012 ecoDemonstrator airplane include variable area fan nozzles, active engine vibration reduction, a regenerative fuel cell, and testing of flight trajectory optimization to enable more efficient routing for fuel savings. American Airlines is loaning a new Next-Generation 737-800 to Boeing to serve as the testbed for these advanced technologies. The flight testing completed in Glasgow allowed Boeing engineers to gather volumes of data about the viability of each technology. After testing is complete, the airplane will be returned to standard configuration and delivered to American later this year.