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Airlines have acquired the type as a comparatively fuel-efficient alternative to other wide-body jets and have increasingly deployed the aircraft on long-haul transoceanic routes.
Direct market competitors include the Airbus A330-300, the Airbus A350 XWB, and the out-of-production A340 and Mc Donnell Douglas MD-11.
GE will improve the fan module and the high pressure compressor stage-1 blisk in the GE-90-115 turbofan, as well as reduce clearances between the tips of the turbine blades and the shroud during cruise.
These improvements, of which the latter is the most important and was derived from work to develop the 787, will, GE says, lower fuel burn by 0.5%.
Commonly referred to as the "Triple Seven", Developed in consultation with eight major airlines, the 777 was designed to replace older wide-body airliners and bridge the capacity difference between Boeing's 767 and 747.