The McDonnell Douglas MD-12 was a large wide-body airliner concept planned by the McDonnell Douglas company in the 1990s. It was first conceived as a trijet larger than the MD-11, then stretched to a quadjet airliner.
source.image: Found And Explained
It was to be similar in size to the Boeing 747, but with greater passenger capacity through two full-length passenger decks. However, the MD-12 received no orders and was canceled. McDonnell Douglas then studied larger MD-11 derivatives named MD-XX without proceeding.
The design grew into the much larger MD-12 with four engines and two passenger decks extending the length of the fuselage. The length of the main MD-12 variants was 63.4 m with a wingspan of 64.9 m. The fuselage was 7.39 m wide and 8.51 m high.
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McDonnell Douglas unveiled its MD-12 design in April 1992. The design was similar in concept to the Airbus A3XX and Boeing New Large Airplane, and it would have been larger than the Boeing 747 with which it would have directly competed. Douglas Aircraft also studied a smaller double-decker design in the 1960s for the aircraft that would eventually become the DC-10.
