Boeing 727
In 1960, Pratt & Whitney wanted to sell its new JT8D turbofan engine design. United and Eastern were interested in this engine, so Pratt & Whitney decided to keep designing it. Eddie Rickenbacker, from Eastern, told Boeing that the airline wanted JT8D engines for its 727s. At first, Boeing did not want to use the JT8D for the 727, but it eventually decided to use the JT8D.