The 777 wing is the most aerodynamically efficient airfoil ever developed for subsonic commercial aviation. The 777's advanced wing enhances the airplane's ability to climb quickly and cruise at higher altitudes and speeds than competing airplanes. It also allows the airplane to carry full passenger payloads out of many high-elevation, high-temperature airfields. The three engine manufacturers developed more efficient and quieter turbofans to power the 777. All three engines offer excellent fuel efficiency, while allowing the 777 to be as quiet as a 767 even though the 777 engines provide 40 percent more power. Key factors in this performance are new, larger-diameter fans with wide-chord fan blade designs and bypass ratios ranging from 6-to-1 to as high as 9-to-1. This compares to the typical 5-to-1 ratio for the engines of previous twin-aisle jets.