Douglas DC-9 airplane model. No other airliner in history has undergone more development than the prolific DC-9/MD-80/MD-90/717 series, which started life with the 70 seat DC-9-10 of the early sixties.
The DC-9 was developed as a short range airliner complementing the much larger DC-8. Development was launched on April 8 1963, with a launch order from Delta following soon after. The DC-9 was an all new design, featuring rear fuselage mounted engines, a Ttail, moderately swept wings and seats for up to 90 passengers.
Construction of the prototype began in July 1963 and the first flight occurred on February 25 1965. Certification and service entry occurred on November 23 and December 8 1965, respectively.