The MD-11 was probably a bad idea. McAir came up with the aircraft because it was a bigger, meaner, DC-10. So much DC-10 that there originally was not going to be an MD-11, but a DC-10 stretch. There were two attempts at this aircraft: a DC-10-10 stretched by 40 feet, and a DC-10-30 stretched by 30 feet. Concurrently, McDonnell Douglas (McAir) was concerned about the range of the 747-SP and began work on an ultra-long-range DC-10 Global.
This research lead to an aircraft series called the DC-10 Super 60. The DC-10 Super 60 was going to be a series. A simple stretch, an ultra-long-range variant, and an aircraft optimized for both range and capacity. Unfortunately for McDonnell Douglas, the American Airlines 191 crash happened – summarily executing the DC-10 program. It did not help that there was economic malaise going on at the time, either.
Being the kings of iteration that they were, in 1981 they decided to revive the large trijet research. Leasing a DC-10-10 from Continental, they studied various winglet configurations in conjunction with NASA. For reasons of marketing, this project would be designated the MD-100. This was an interesting project as it actually offered more engine options than the final MD-11, in the form of the Rolls Royce RB.211. By November 1983, it was clear there was no interest in the MD-100. The board shuttered it.