McDonnell Douglas MD-94X
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The McDonnell Douglas MD-94X was a planned propfan-powered airliner, intended to begin production in 1994. The aircraft was to seat between 160 and 180 passengers in an unknown seating configuration. An all-new design, it was developed in the late 1980s to compete with the similar Boeing 7J7. Configuration was similar to the MD-80, but advanced technologies such as canard noseplanes, laminar and turbulent boundary layer control, side-stick flight control (via fiber optics), and aluminum-lithium alloy construction were under consideration.
Airline interest in the brand-new propfan technology was weak despite claims of up to a 60% reduction in fuel use, and both aircraft were cancelled.
Under development at the same time were two propfan variants of the MD-80. The MD-91X would have seated 100-110 and entered service in 1991, and the MD-92X was to seat 150 and enter service in 1992.
Existing DC-9s and MD-80s would also have been eligible for an upgrade to the new propfan powerplants.
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