USAir Boeing B-767-201ER N647US CN 23899 LN 182 Editorial Image

The Boeing 767 is an American wide-body airliner developed and manufactured by Boeing Commercial Airplanes. The aircraft was launched as the 7X7 program on July 14, 1978, the prototype first flew on September 26, 1981, and it was certified on July 30, 1982. The initial 767-200 variant entered service on September 8, 1982, with United Airlines, and the extended-range 767-200ER in 1984. It was stretched into the 767-300 in October 1986, followed by the extended-range 767-300ER in 1988, the most popular variant. The 767-300F, a production freighter version, debuted in October 1995. It was stretched again into the 767-400ER from September 2000.767-200ERThe 767-200ER was the first extended-range model and entered service with El Al in 1984. The type's increased range is due to extra fuel capacity and higher maximum takeoff weight (MTOW) of up to 395,000 lb (179,000 kg). The additional fuel capacity is accomplished by using the center tank's dry dock to carry fuel. The non-ER variant's center tank is what is called cheek tanks two interconnected halves in each wing root with a dry dock in between. The center tank is also used on the -300ER and -400ER variants.