Originally Posted by MSPeconomist

I don't think this is true Premium Economy, especially in October before the first regularly scheduled A350 flights. It's C+ which on DL books into W class, but they're just coach seats with a few inches of extra legroom and some very minor other perks. Think of this as the equivalent of Y+ on UA.

Still W probably earns extra MQMs, but I haven't checked the rules on this recently.