Back Quadrireactor Catalan Vierstrahliges Flugzeug German هواپیمای جت چهارموتوره Persian Quadriréacteur French クワッドジェット Japanese 사발 제트기 Korean Quadrijato Portuguese
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. Many of the first purpose-built jet airliners had four engines, among which stands the De Havilland Comet, the world's first commercial jetliner. In the decades following their introduction, their use has gradually declined due to a variety of factors, including the approval of twin-engine jets to fly farther from diversion airports as reliability increased, and an increased emphasis on fuel efficiency.