The JT8 is the workhorse powerplant for the airline industry. More than 350 operators use the JT8 to power more than 4500 aircraft - nearly a third of the world's commercial fleet.

The JT9 family opened a new era in commercial aviation: the high-bypass ratio engine to power wide-body aircraft. It introduced many advanced technologies in structures, aerodynamics and materials to improve fuel efficiency and reliability.

A turbofan version of the J57 developing up to 21,000 pounds of thrust.