Boeing Co’s newest and largest 777 model, the 777-9, took off successfully on its first flight on Friday January 24, kicking off a flight test program for the high-tech jet.

The 777X builds on the market-leading 777 and the 787 Dreamliner to offer airlines the largest and most-efficient twin-engine jet in the world. The airplane provides 12 percent lower fuel consumption and 10 percent lower operating costs than competing airplanes.

The 777X achieves the unprecedented performance through the introduction of the latest technologies such as the most fuel-efficient commercial engine ever, the GE9X, and a fourth-generation all-new composite wing design that provides lift and efficiency. With the extension of a set of folding, raked wingtips, the airplane’s wing spans 235 feet (72 meters).

By adding folding wingtips, the 777X’s wingspan has been increased to enhance the aerodynamic efficiency of the wing, reducing engine thrust and fuel use. Additionally, the folding wingtips allow the 777X to maintain airport compatibility with the existing 777 family, adding value for customers.

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