The Douglas DC-9-40, a member of the DC-9 family of twin-engine, narrow-body jet airliners, was initially designed and manufactured by McDonnell Douglas. Introduced in 1968, it’s an elongated variant of the DC-9-30, featuring a stretched fuselage for increased passenger capacity. The DC-9-40 has a maximum capacity of 125 passengers in a single-class configuration or 107 passengers in a two-class layout. This aircraft model is powered by two Pratt & Whitney JT8D-9A turbofan engines, providing a range of up to 1,550 nautical miles (2,870 kilometers).
The DC-9-40 gained popularity among airlines due to its versatility and efficiency. Compared to its predecessor, the DC-9-30, the -40 variant offered increased seating capacity while maintaining similar operating costs. Its popularity led to the production of over 900 DC-9-40 aircraft, with many still in operation today. Over the years, the DC-9-40 has undergone several upgrades and modifications, including enhanced avionics and improved cabin interiors.