The Boeing 777 is quite fast for a commercial airliner, typically cruising at Mach 0.84, which is approximately 560 mph (900 km/h) at altitude. While it isn't the absolute fastest plane in the sky—the Boeing 747-8 and the Airbus A350 can cruise slightly faster at Mach 0.85 or 0.86—the 777 is renowned for its immense power. Its GE90 engines are some of the most powerful jet engines ever built, allowing the "Triple Seven" to reach its cruising altitude very quickly even when fully loaded with fuel and passengers for a 15-hour flight. In certain "tailwind" conditions, such as riding a strong jet stream across the Atlantic, ground speeds for the 777 have been recorded exceeding 700 mph, though its speed through the air remains within the standard high-subsonic range to maintain fuel efficiency and structural integrity.