Add the MD-XX

Given the variety of widebodies fades after the 2010s, perhaps this could stretch out the longevity of the MD11 family:

globalsecurity.org/military/sy...

And then of course a bit down:

The stretch version of the MD-XX would have the same or greater range than the MD-11, while carrying 25 percent more passengers and baggage. The aircraft would seat 375 passengers in typical three-class arrangement. With all-economy seating, it would carry up to 515 passengers. The long range model was being designed to fly 20 percent farther than the MD-11, with a full load of 309 passengers and baggage.