Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits. Anti-spam check. Do not fill this in!===Further developments=== In April 1965, Douglas announced belated fuselage stretches for the DC-8, with not just one but 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 ceased in 1972, 262 of the stretched DC-8s had been made. With the ability to seat 269 passengers, the DC-8 was easily the largest airliner available, and remained so until the [[Boeing 747]] arrived in 1970. All the earlier jetliners were 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 [[New York Port Authority]] 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. In the early 1970s several airlines approached McDonnell Douglas for noise reduction modifications to the DC-8 but nothing was done. Third parties had developed aftermarket [[hush kit|hushkits]] but there was no real move to keep the DC-8 in service. Finally, in 1975, [[General Electric]] began discussions with major airlines with a view to fitting the new and vastly quieter Franco-American [[CFM International CFM56|CFM56]] engine to both DC-8s and 707s. MDC remained reluctant but eventually came on board in the late 1970s and helped develop the 70 Series DC-8s. The Super Seventies were a great success: roughly 70% quieter than the 60-Series and, at the time of their introduction, the world's quietest four-engined airliner. As well as being quieter and more powerful, the CFM56 was roughly 20% more fuel efficient than the JT3D, which reduced operating costs and extended the range. Summary: Please note that all contributions to the Aircraft Wiki are considered to be released under the CC-BY-SA Cancel Editing help (opens in new window) Retrieved from "https://aircraft.fandom.com/wiki/Douglas_DC-8"