I flew NW #57 as well on Wednesday of this week. Great, great flight attendants. I even wrote TTU to commend them. The whole crew was great, but the ones in WBC were fantastic.
You can really tell on the international flights when it is a MEM based crew vs. others. I fly that MEM flight a few times a year vs. through DTW or MSP. The MEM FAs are awesome on that flight.