Four-engined jet aircraft
A four-engined jet, sometimes called a quadjet, is a jet aircraft powered by four engines. The presence of four engines offers increased power and redundancy, allowing such aircraft to be used as airliners, freighters, and military aircraft (bomber, cargo, tanker). Many of the first purpose-built jet airliners of the 1950s had four engines, among which stands the de Havilland Comet, the world's first commercial jetliner. The quadjets were already challenged in the 1960s by trijets, and since the 1970s by Wide-body aircraft with only two but big turbofan jet engines which are more efficient. In the decades following their introduction, the use of "gas-guzzling four-engined" airliners has gradually declined due to a variety of factors, including ETOPS rules approving twin-engine jets to fly farther from diversion airports as reliability increased, and an increased emphasis on fuel efficiency.
Read on Wikipedia · Image Mexicana_de_Havilland_Comet_APM.jpg: Aviation Photography of Miami derivative work: Altair78, GFDL 1.2
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