McDonnell Douglas DC-9

The McDonnell Douglas DC-9 is a family of twin-engine, narrow-body jet airliners developed by Douglas Aircraft Company and later produced by McDonnell Douglas. Its rear-mounted engines and tail-mounted horizontal stabilizer distinguish its design.

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Rear-engine aircraft: An aircraft with its engines mounted on or near the rear fuselage. The DC-9’s engines sit at the rear, leaving its wings clear of engine nacelles.
Douglas Aircraft Company: An American aircraft manufacturer that merged with McDonnell Aircraft in 1967. Douglas developed the DC-9 before the company merger changed its name.
Narrow-body aircraft: An airliner with a single aisle between passenger seats. The DC-9 is a single-aisle aircraft sized for lower-capacity routes.
Delta Air Lines: A major American airline founded in 1925. Delta became a major DC-9 operator and flew members of the family for decades.
Aircraft noise: Sound produced by aircraft, especially during takeoff, climb, and landing. Early DC-9s became associated with high noise levels from their low-bypass turbofan engines.
T-tail: An aircraft tail configuration with the horizontal stabilizer mounted atop the vertical stabilizer. The DC-9 places its horizontal stabilizer high to keep it clear of engine exhaust.
McDonnell Douglas: An American aerospace manufacturer formed by the 1967 merger of McDonnell Aircraft and Douglas Aircraft Company. The merged company continued producing and developing the DC-9 family.
Jet airliner: A passenger aircraft powered by jet engines and designed for scheduled airline service. The DC-9 belongs to the jet-airliner generation that replaced many piston and turboprop transports.
Air Canada: Canada’s largest airline, founded in 1937 as Trans-Canada Air Lines. Air Canada operated DC-9s on domestic and cross-border routes.
Fuel efficiency: The amount of useful transport or work obtained from a given quantity of fuel. The DC-9’s older engines became less competitive as fuel prices and efficiency standards changed.