How long was the McDonnell Douglas MD-11 in production?

Why the MD-11 was one of the worst failures in modern aviation history.
Forbes

90 Years After Its First Flight, Over 150 Douglas DC-3s Still Fly

Perhaps the most important aircraft in the history of commercial aviation was the Douglas DC-3. This year will mark the 90 th anniversary of the first commercial flight of the DC-3. On June 25, 1936, ...