I'm also on those flights on Friday. I'm a Platinum and I also didn't get DCA-MEM; it looks like there may not even be revenue seats available at the moment. MEM-LAS cleared for my non-status companion & I at the regular interval, and last night LAS-IND on the return cleared for both of us, again at the same interval (5 days shortly after midnight).

My experience has been that the system runs several times throughout the day and will keep trying for you. I've never been passed over for a lesser-status pax on NW (on CO however...that's another story!). Judging by the current loads I don't think you'll have a problem pulling these.

We'll be in the WorldClub at DCA before our flight. With luck there will be a couple (or more) no-shows and F will open up for the first segment. Good luck!