So the question is: Does 717 apply to the C-135, or to the MD-95?
And the answer is "yes" - both types have carried the 717 designation.
Further - check out the DC-10 type certificate. You'll find there a DC-10-20, but NOT a DC-10-40. Just before NWA took delivery of their P&W-powered ships, Don Nyrop pressured McD-D into making all the marketing brochures read "DC-10-40" to imply their ship was more advanced than the -30 airplane.
But the nameplate still read DC-10-20, and its fuel burn was always greater than the -30.
