==See also==* Trimotor* Twinjet* S-duct* Wide-body aircraft==References==*"Modern Commercial Aircraft" Willian Green, Gordon Swanborough and John Mowinski, 1987==External links==* Stanford University Aircraft Aerodynamics and Design Group "Engine Placement" Accessed 2007-03-13*Undeveloped MD-11/MD-12 models page*Patent for a triple engine fighter*Patent for a triple engine fighter*NR-349 interceptor proposal
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