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The Boeing 747-400 is a major development and the best-selling model of the Boeing 747 family of jet airliners . While retaining the four-engine wide-body layout of its predecessors, the 747-400 embodies numerous technological and structural changes to produce a more efficient airframe . Its most distinguishing features versus preceding 747 models are 6-foot (1.8 m) winglets mounted on 6-foot (1.8 m) wing tip extensions, which are found on all 747-400s except for Japanese domestic market versions.
Featuring only four engines, the design also required new engine designs with greatly increased power and better fuel economy. In May 1964, airframe proposals arrived from Boeing, Douglas , General Dynamics , Lockheed , and Martin Marietta ; engine proposals were submitted by General Electric , Curtiss-Wright , and Pratt & Whitney . After a downselect, Boeing, Douglas, and Lockheed were given additional study contracts for the airframe, along with General Electric and Pratt & Whitney for the engines. 
The First Class and Business Class sections of the 747-8 enable airlines to offer passengers the most private and premium accommodations in the sky. So it's no surprise that on high-volume routes the 747-8 offers premium revenue potential. And with more than 400 seats available, this new 747 creates a unique opportunity to maximize the bottom-line potential of any high-volume route. It's premium value, delivered, for operators and passengers. That's a better way to fly.
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