Boeing said it has begun certification testing for a package of 737NG performance improvements intended to reduce fuel consumption by 2%. Testing is being conducted on a 737-800 painted in the new United Airlines 737-800 that completed its first test flight last week. One percent of the savings comes from a package of aerodynamic improvements the airframe and 1% through the CFM56-7BE engine enhancement program offering LPT and HPT modifications. Other changes will cause the engine to run ...

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