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6. Pratt & Whitney JT 3D Turbofan
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Being among the first successful turbofan engines, the JT3D represented a major development in commercial aviation. Compared to previous turbojets, its dual-spool architecture and bypass ratio configuration greatly increased fuel economy and lowered noise levels. Powering well-liked aircraft like the Boeing 707 and Douglas DC-8, the engine's dependability and performance qualities made it perfect for long-haul commercial flights. The success of the JT3D helped to define the turbofan as the commercial aviation standard powerplant.
