In 2011 Continental Airlines initiated a program to save fuel under the umbrella of their “Eco-Skies” program. Improved flight planning, single-engine taxiing, winglets and other initiatives are being used to reduce the airline’s total consumption of jet fuel. To commemorate the program, 737-800 N76516 had its livery modified with special “eco-skies” markings including green blended winglets. When Continetal merged with United, the aircraft was updated with United titles and fleet numbers.