Background At the end of World War II, Douglas was the dominant North American aircraft producer in the
commercial aviation market. Douglas produced a succession of piston-engined aircraft (
DC-2,
DC-3,
DC-4,
DC-5,
DC-6, and
DC-7) through the 1930s, 1940s, and 1950s. While
de Havilland flew the world's first jet airliner, the
Comet, in May 1949, Douglas initially refrained from developing a jet airliner. De Havilland's pioneering Comet entered airline service in May 1952. Initially, it appeared to be a success, but the Comet was grounded in 1954 after two fatal accidents which were subsequently attributed to rapid
metal fatigue failure of the pressure cabin. Various aircraft manufacturers benefited from the findings and experiences gained from the investigation into Comet losses; specifically, Douglas paid significant attention to detail in the design of the DC-8's pressurized cabin. By 1952, Douglas had continued its success as a commercial aircraft manufacturer, having received almost 300 orders for its piston-engine DC-6 and its successor, the DC-7, which had yet to fly. The Comet disasters, and the airlines' subsequent lack of interest in jets, seemed to validate the company's decision to remain with
propeller-driven aircraft, but its inaction enabled rival manufacturers to take the lead instead. As early as 1949, rival company Boeing had started design work on a pure jet airliner.
Boeing's military arm had experience with large long-range jets, such as the
B-47 Stratojet and the
B-52 Stratofortress strategic bombers. While producing and supporting these bombers for the
United States Air Force (USAF), Boeing had developed a close relationship with the USAF's
Strategic Air Command (SAC). The company also supplied the SAC's refueling aircraft, the piston-engined
KC-97 Stratofreighters, but these proved to be too slow and low flying to easily work with the new jet bombers. The B-52, in particular, had to descend from its cruising altitude and then slow almost to its stall speed to refuel from the KC-97. Believing that a requirement for a jet-powered tanker was a certainty, Boeing started work on a new jet aircraft for this role that could be adapted into an airliner. As an airliner, it would have similar
seating capacity to the Comet, but the use of a
swept wing enabled a higher cruising speed and better range. First presented in 1950 as the
Model 473-60C, Boeing failed to generate any interest from airlines, yet remained confident that the project was worthwhile and pressed ahead with a prototype, the
Boeing 367-80 ("Dash-80"). After spending $16 million of its own money to build it, the Dash-80 rolled out on May 15, 1954.
Early design phase During mid-1952, Douglas opted to covertly begin work on definition studies for a jet-powered transport aircraft. The company's design team examined various arrangements, including some that closely resembled the Comet. The fuselage featured a double-bubble cross-section that produced relatively low
drag while providing for a relatively spacious passenger cabin along with a large cargo deck that was sufficiently tall as to permit ground crews to stand up within it. While Douglas remained lukewarm about the jet airliner project, it believed that the USAF tanker contract would go to two companies for two different aircraft, as several USAF transport contracts in the past had done. In May 1954, the USAF circulated its requirement for 800 jet tankers to Boeing, Douglas,
Convair,
Fairchild Aircraft,
Lockheed Corporation, and
Martin Marietta. At the time, Boeing was only two months away from having its prototype in the air. Just four months after issuing the tanker requirement, the USAF ordered the first 29
KC-135 Stratotankers from Boeing. Following consultations with the airlines, several design changes were made, such as the fuselage being widened by to permit six-abreast seating, which in turn led to larger wings and tail surfaces being adopted along with a lengthening of the fuselage. The existence of the DC-8 was formally announced on 7 June 1955; at the time of the announcement, the development costs had been forecast to be roughly $450 million. Four versions were offered to begin with, all with the same long airframe with a wingspan, but varying in engines and fuel capacity, and with maximum weights of about 240,000–260,000 lb (109–118 metric tons). Douglas steadfastly refused to offer different fuselage sizes. The maiden flight was planned for December 1957, with entry into revenue service in 1959. Aware that the program was lagging behind Boeing, Douglas began a major marketing push to promote its new jetliner.
First orders Douglas' previous thinking about the airliner market seemed to be coming true; the transition to turbine power looked likely to be to
turboprops rather than turbojets. The pioneering 40–60-seat
Vickers Viscount was in service and proving popular with passengers and airlines: it was faster, quieter, and more comfortable than piston-engined types. Another British rival was the 90-seat
Bristol Britannia, and Douglas's main rival in the large airliner market,
Lockheed Corporation, had committed to the short to medium range 80–100-seat turboprop
Electra, with a launch order from
American Airlines for 35 and other orders flowing in. Meanwhile, the Comet remained grounded, the French 90-passenger twin jet
Sud Aviation Caravelle prototype had just flown for the first time, and the Boeing 707 was not expected to be available until late 1958. To buy one expensive and untried jet-powered aircraft type was brave: to buy both was, at the time, unheard of. In the closing months of 1955, other airlines rushed to follow suit:
Air France, American Airlines,
Braniff International Airways,
Continental Airlines, and
Sabena ordered 707s;
United Airlines,
National Airlines,
KLM,
Eastern Air Lines,
Japan Air Lines, and
Scandinavian Airlines System (SAS) chose the DC-8. In 1956, Air India,
BOAC,
Lufthansa,
Qantas, and TWA added over 50 to the 707 order book, while Douglas sold 22 DC-8s to Delta, Swissair, TAI,
Trans Canada, and UAT. By the start of 1958, Douglas had sold 133 DC-8s compared to Boeing's 150 707s. In September 1956, production of the first prototype commenced. Later that year, an enlarged version of the Comet finally returned to service, but had arrived too late to secure a substantial portion of the market: de Havilland secured just 25 orders. In August, Boeing had begun delivering 707s to Pan Am. Douglas made a massive effort to close the gap with Boeing, using no fewer than ten aircraft for flight testing to achieve
Federal Aviation Administration (FAA) certification for the first of the many DC-8 variants in August 1959. Several modifications proved to be necessary: the original
air brakes on the lower rear fuselage were found to be ineffective and were deleted as engine
thrust reversers had become available; unique
leading-edge slots were added to improve low-speed lift; the prototype was short of its promised cruising speed and a new, slightly larger wingtip had to be developed to reduce
drag. Also, a recontoured wing
leading edge was later developed to extend the chord 4% and reduce drag at high Mach numbers. On August 21, 1961, a DC-8-43 broke the
sound barrier at Mach 1.012 (668 mph/1,075 km/h) while in a controlled dive through and maintained that speed for 16 seconds. The flight was to collect data on a new leading edge design for the wing, and, while doing so, the DC-8-43 became the first civilian jet – and the first jet airliner – to make a supersonic flight. The aircraft was DC-8-43 registered as
CF-CPG, later delivered to
Canadian Pacific Air Lines. The aircraft, crewed by Captain William Magruder, First Officer Paul Patten, Flight Engineer Joseph Tomich and Flight Test Engineer Richard Edwards, took off from
Edwards Air Force Base in
California and was accompanied to altitude by a
Lockheed F-104A-10-LO Starfighter supersonic chase aircraft flown by
Chuck Yeager and one
North American F-100 Super Sabre also supersonic.
Entry into service on September 18, 1959. On September 18, 1959, the DC-8 entered service with Delta Air Lines and United Airlines. According to the Delta Air Lines website, the air carrier was the first to operate the DC-8 in scheduled passenger service. By March 1960, Douglas had reached its planned production rate of eight DC-8s per month. Despite a large number of DC-8 early models being available, all used the same basic airframe, differing only in engines, weights and details; in contrast, the rival
Boeing 707 range offered several fuselage lengths and two wingspans: the original 707-120, a version that sacrificed space to gain longer range, and the stretched 707-320, which at overall had more cabin space than the DC-8. Douglas' refusal to offer different fuselage sizes made it less adaptable and compelled airlines such as Delta and United to look elsewhere for short to medium range types. Delta ordered
Convair 880s while United chose the newly developed short-fuselage 707-020. United prevailed on Boeing to rename the new variant the
Boeing 720 in case the public thought they were dissatisfied with the DC-8. Pan Am never reordered the DC-8 and Douglas gradually lost market share to Boeing. In 1962, DC-8 sales dropped to just 26 aircraft that year, followed by 21 in 1963 and 14 in 1964; many of these later deliveries were of the
Jet Trader model rather than the more-prestigious passenger versions. In 1967, Douglas merged with
McDonnell Aircraft, becoming
McDonnell Douglas.
Further developments During the early 1960s, Douglas began considering stretching the DC-8, a feat that was eased by its fuselage keeping the same dimensions across its length. In April 1965, the company announced belated fuselage stretches for the DC-8 with three new models known as the
Super Sixties. The DC-8 program had been in danger of closing with fewer than 300 aircraft sold, but the Super Sixties brought fresh life to it. By the time production of the DC-8 ceased in 1972, 262 of the Super Sixties had been completed, almost half of all models produced. With the ability to seat 269 passengers, the DC-8 Series 61 and 63 had the largest passenger-carrying capacity available. That remained so until the
Boeing 747 arrived in 1970. All of the earlier jetliners were relatively noisy by modern standards. Increasing traffic densities and changing public attitudes led to complaints about aircraft noise and moves to introduce restrictions. As early as 1966 the
Port Authority of New York and New Jersey expressed concern about the noise to be expected from the then still-unbuilt DC-8-61, and operators had to agree to operate it from New York at lower weights to reduce noise. By the early 1970s, legislation for aircraft noise standards was being introduced in many countries, and the 60 Series DC-8s were particularly at risk of being banned from major airports. s. In the early 1970s, several airlines approached McDonnell Douglas with requests for noise reduction modifications to their DC-8s. While third parties had developed aftermarket
hushkits, there was initially no meaningful action taken by Douglas to fulfil these requests and effectively enable the DC-8 to remain in service. Finally, in 1975,
General Electric began discussions with major airlines to fit the new and vastly-quieter Franco-American
CFM56 engine to both DC-8s and 707s. MDC remained reluctant but eventually came on board in the late 1970s and helped develop the Series 70.
United Airlines retired its last DC-8-71 on October 31, 1991. The final scheduled all-passenger DC-8 services were operated by
Hawaiian Airlines using DC-8-62 and DC-8-63 models, which were retired in August 1993. The ultimate commercial passenger service for the DC-8 was provided by
Air Transport International (ATI) through passenger charters and combi missions using DC-8-62 and DC-8-72 combi variants. While ATI also operated early DC-8-55s and "Super" 60/70 series (divided into DC-8-61/63 and DC-8-71/73), those models primarily served as pure freighters; only the DC-8-62/72 maintained long-term "passenger cabins" (rear cabins) and windows. These services concluded on May 17, 2013, with the very last DC-8-72 retiring in 2015, marking the official end of all commercial passenger services for the DC-8 worldwide. ATI subsequently replaced these aircraft with a fleet of newer models, including the
Boeing 757 and
Boeing 767. The final DC-8 aircraft maintained in a passenger-capable configuration (Registration: N782SP, formerly ATI N721CX) was retired from commercial service in 2015 and subsequently acquired by
Samaritan's Purse. This DC-8-72CF featured a 'Combi' layout, retaining a rear passenger cabin with windows and seating alongside a forward cargo compartment. Following a decade of humanitarian service, the aircraft conducted its final operational flight on November 14, 2025. It was replaced by a Boeing 767 and donated to
Liberty University for static preservation and educational use, and will go on display at
Lynchburg Regional Airport in
Lynchburg, Virginia. By 2002, of the 1,032
Boeing 707s and
720s manufactured for commercial use, just 80 remained in service – though many of those 707s were converted for
USAF use, either in service or for spare parts. Of the 556 DC-8s made, around 200 were still in commercial service in 2002, including about 25 50-Series, 82 of the stretched 60-Series, and 96 out of the 110 re-engined 70-Series. Most of the surviving DC-8s are now used as freighters. In May 2009, 97 DC-8s were in service following
UPS's decision to retire its remaining fleet of 44. In January 2013, an estimated 36 DC-8s were in use worldwide. As a result of aging, increasing operating costs and strict noise and emissions regulations, the number of active DC-8s continues to decline, with the youngest airframes having exceeded 50 years of age in 2022. == Variants ==