I'm surprised that nobody has mentioned this yet, but e-mail subscribers got another Asia sale offer two days ago. Supposedly "as low as $309 each way!!!!!!".
Use reference number PR003 and your WorldPerks number. If you're already subscribed, it should work.
Last day to ticket is October 4. Dates of travel must commence between October 17th and November 27th.
Here's the
web page with the details.
(I scanned the first bunch of pages of FT threads, but didn't see anything mentioning this current promotion standing out... of course I will probably have somebody show me if I missed a thread).