I fly in/out of DCA often and I'd estimate that for the last 10 months or so (at least) I've been on a new 738 approx. 90% of the time. What I find shocking is that I'd estimate that only 50-60% of the new 738s that I've been on have wifi. Why in the world AA is not configuring these new planes with wifi is beyond me.
I do prefer the new 738 F seats compared to the old ones.