The mid-size 757 and 767 launched to market success, due in part to 1980s' extended-range twin-engine operational performance standards ( ETOPS) regulations governing transoceanic twinjet operations. In 1978, Boeing unveiled three new models: the twin-engine Boeing 757 to replace its 727, the twin-engine 767 to challenge the Airbus A300, and a trijet 777 concept to compete with the DC-10 and L-1011. In the early 1970s, the Boeing 747, McDonnell Douglas DC-10, and the Lockheed L-1011 TriStar became the first generation of wide-body passenger airliners to enter service. As of September 2021, the 777 had been involved in 31 aviation accidents and incidents, including 8 hull losses (5 during flight and 3 on the ground) with 541 fatalities, and 3 hijackings. As of 2018, Emirates was the largest operator, with 163 aircraft. By March 2018, the 777 had become the most produced Boeing wide-body jet, overtaking the Boeing 747. The most common and successful variant is the 777-300ER with 838 aircraft ordered and 832 delivered. More 777s have been ordered and delivered than any other wide-body airliner as of April 2023, more than 60 customers had placed orders for 2,142 aircraft of all variants, with 1,706 delivered. In November 2013, Boeing announced the 777X development with the -8 and -9 variants, both featuring composite wings with folding wingtips and General Electric GE9X engines. These long haul variants use 110,000–115,300 lbf (489–513 kN) GE90 engines and have extended raked wingtips. These 777 Classics were powered by 77,200–98,000 lbf (343–436 kN) General Electric GE90, Pratt & Whitney PW4000, or Rolls-Royce Trent 800 engines. The original 777 with a maximum takeoff weight (MTOW) of 545,000–660,000 lb (247–299 t) was produced in two fuselage lengths: the initial 777-200 was followed by the extended-range -200ER in 1997 and the 33.25 ft (10.13 m) longer 777-300 in 1998. It initially competed with the Airbus A340 and the McDonnell Douglas MD-11, both now out of production, and as of 2021 competes with the Airbus A350 and A330-900. It is the first Boeing aircraft with fly-by-wire controls.

It is recognizable for its large-diameter turbofan engines, six wheels on each main landing gear, fully circular fuselage cross-section, and a blade-shaped tail cone. It can accommodate a ten–abreast seating layout and has a typical 3-class capacity of 301 to 368 passengers, with a range of 5,240 to 8,555 nautical miles (9,700 to 15,840 km). Longer range variants were launched in 2000, and were first delivered in 2004.

The 777 entered service with the launch customer, United Airlines, in June 1995. The prototype was rolled out in April 1994, and first flew in June. Developed in consultation with eight major airlines, with a first meeting in January 1990, the program was launched in October, with an order from United Airlines. The 777 was designed to bridge the gap between Boeing's other wide body airplanes, the twin-engined 767 and quad-engined 747, and to replace older DC-10s and L-1011 trijets.

The Boeing 777, commonly referred to as the Triple Seven, is an American long-range wide-body airliner developed and manufactured by Boeing Commercial Airplanes. 1,706 as of April 2023 based on deliveries

777 cockpit takeoff