As well as being quieter and more powerful, the CFM56 was up to 23% more fuel efficient than the JT3D, which reduced operating costs and extended the range.
Ademais de ser máis silencioso e potente, o motor CFM56 era un 20% máis eficiente en termos de combustible que o JT3D, o que reduxo os custes de operación e aumentou o seu alcance.