With it's efficient wings the glide ratio of the B 777 should be around 15:1. Extrapolating, from a Flight Level of 390 gives us a theoretical gliding distance of about 110 Miles.
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All fixed-wing aircraft have some capability to glide with no engine power; that is, they do not fall straight down like a stone, but rather continue to glide moving horizontally while descending.
The glide ratio of a clean A320 is 17:1 which means it can travel 17 units of distance forwards for every 1 unit of distance downward at best glide speed. Using your figure of 11,000 meters away and multiplying by 17 results in a maximum range of 187km .
Its engines are the most powerful in the worldThe sole engine option on the 777-300ER is the General Electric GE90-115B, delivering approximately 115,000 pounds of takeoff thrust in each engine.
The Boeing 777 is the best-selling long-haul carrier in the history of aviation. It has an exceptional life-span of 30 years, but what's the secret behind this record-breaking longevity? In this film, a 777 is taken apart, inspected, and entirely refurbished.
Boeing 777The 777 is a workhorse for overseas flights with variations, like the 777-8 with a range of up to 8,730 nautical miles and the newer 777-9 configuration with a range of 7,285 nautical miles. The “Triple Seven” flies at Mach 0.84, or 644 mph and can hold up to 426 passengers.