The Pratt & Whitney JT8D is a high-bypass turbofan engine designed for commercial aircraft. Introduced in the 1960s, it has been widely used in various models, including the Boeing 727 and McDonnell Douglas DC-9. The engine is known for its reliability and efficiency, making it a popular choice for airlines. With a thrust range of 14,500 to 18,500 pounds, the JT8D has powered thousands of aircraft over the decades. Its design features a two-spool configuration, which helps optimize performance and fuel consumption. The engine has played a significant role in the evolution of commercial aviation.