I just bought a LAX-SEA-NRT-MNL and back for $1816 all in this summer in WBC. I get to enjoy AS F to SEA, then the good old 742 SEA-NRT, and maybe (if I'm lucky) the new WBC from NRT to MNL.
I'm going for about 40 days, and most of the cheapest tickets are for 30 day stays or less--in fact, this fare is only about $300 more than the M class fare for my travel dates (June 30 to August 11) LAX-MNL! With 22,850 EQMs, too. Availability wasn't great, but there are still many days with seats. I think the fare is only available Mon to Thurs travel.