The Douglas DC-8, a long-range commercial aircraft, was initially designed for the United States Air Force as an aerial refueling tanker. After losing the contract to Boeing's KC-135 Stratotanker, Douglas shifted focus to civil aviation. The DC-8 became popular among airlines worldwide since its introduction in the late 1950s. Despite most being retired or scrapped, three remain operational today.
Douglas introduced design changes to compete with Boeing's 707 after losing the USAF contract. The DC-8 entered commercial service in September 1959 with Delta Air Lines and United Airlines. Over 550 units were produced until 1972, many later serving cargo operations before retirement.
The DC-8 featured a low-wing configuration and was powered by four Pratt & Whitney JT3C turbojet engines. Its original design aimed at military use but was adapted for commercial viability. The aircraft could accommodate up to 260 passengers depending on configuration.