The McDonnell Douglas MD-12 was an aircraft design study undertaken by the McDonnell Douglas company in the 1990s for a "superjumbo" aircraft, first conceived as a larger trijet, then stretched to a 4-engine airliner. It was to be similar in size to the Boeing 747, but with more passenger capacity. However, the MD-12 received no orders and was canceled. McDonnell Douglas then studied larger MD-11 derivatives named MD-XX without proceeding.
For more information, visit:
https://en.wikipedia.org/wiki/McDonnell_Douglas_MD-12
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