It's been to SEA twice (as of last month). From what I understand, they haven't used it on true longhauls.
Huh. That's lame to put it on a 2-2.5 hour flight when there are lots of intra-CA/SFO-LAS flights to stick it on, though I guess AS and WN don't have Red. It makes sense, though- I know the LAS-SFO flight ends up becoming the SFO-SEA flight on occasion (I flew it- got off the plane from Y, told the FAs I'd be back, back on in F 50 minutes later).
I certainly hope they get a plane or three in the next few months and can send that one in for its Red fitting, though.
My take on the announcement is that capacity will remain the same in terms of the system, but capacity will get shifted around. I did not read anything about "expansion slowdown", although that seems to have been going on for a while now, as they haven't introduced any new stations.
Like I said, it's buried in the press release. To me, "10 percent less capacity in the fourth quarter than... previously projected" sounds like slowing down their expansion and tweaking their growth plans- dropping some frequencies that aren't working so well and so on.