The McDonnell Douglas MD-12 was a proposed design for a "super jumbo" in the 1990s. Originally the MD-12 was considered as a "tri jet" then changed to a four engined aircraft.
In 1991 McDonnell Douglas divided its Military and Civil divisions in an attempt to raise the funds for the project. The company unveiled its design in 1992 and was similar to the Boeing NLA and Airbus A3XX, the MD-12 was bigger then the Boeing 747.
McDonnell Douglas advertised the aircraft everywhere possible at Air shows and in the aviation press but no orders for the aircraft was placed and the company lacked resources and money so the project was scrapped.
Purpose: Jet airliner, double deck, wide body.
Status: Design Study, Cancelled