<Tr> <Th> Unit cost </Th> <Td> 777 - 200ER: US $261.5 million 777 - 200LR: US $296.0 million 777 - 300ER: US $320.2 million 777F: US $300.5 million </Td> </Tr> <Tr> <Th> Developed into </Th> <Td> Boeing 777X </Td> </Tr> <P> The Boeing 777 is a family of long - range wide - body twin - engine jet airliners developed and manufactured by Boeing Commercial Airplanes . It is the world's largest twinjet and has a typical seating capacity of 314 to 396 passengers, with a range of 5,240 to 8,555 nautical miles (9,704 to 15,844 km). Commonly referred to as the "Triple Seven", its distinguishing features include the largest - diameter turbofan engines of any aircraft, six wheels on each main landing gear, fully circular fuselage cross-section, and a blade - shaped tail cone . Developed in consultation with eight major airlines, the 777 was designed to replace older wide - body airliners and bridge the capacity difference between Boeing's 767 and 747 . As Boeing's first fly - by - wire airliner, it has computer - mediated controls . It was also the first commercial aircraft to be designed entirely with computer - aided design . </P> <P> The 777 is produced in two fuselage lengths as of 2017 . The original 777 - 200 variant entered commercial service in 1995, followed by the extended - range 777 - 200ER in 1997 . The stretched 777 - 300, which is 33.25 ft (10.1 m) longer, followed in 1998 . The initial 777 - 200, - 200ER and - 300 versions are equipped with General Electric GE90, Pratt & Whitney PW4000, or Rolls - Royce Trent 800 engines . The extended - range 777 - 300ER and ultra long - range 777 - 200LR variants entered service in 2004 and 2006 respectively, while the 777F, a freighter version, debuted in February 2009; these variants all feature high - output GE90 engines and extended raked wingtips . The 777 - 200LR is one of the world's longest - range airliners, able to fly more than halfway around the globe and holds the record for the longest distance flown non-stop by a commercial aircraft . </P>

What is the range of a boeing 777