the SDC options looked a bit better than usual for me this week.. on a K fare, i was able to switch onto something showing Y5.....K1.L0. in previous weeks, i would see everything showing Y5.B1.M0....
are they maybe starting to tune things a bit better? or did i just fly a different route this week?
the fare class thing can work, if delta understands that day of travel availability is a different game than advance purchase availability, and starts tweaking specifically for SDC.