American AAdvantage is offering discounted award redemptions for travel on Japan Airlines on select routes.
For bookings made by November 1 for travel between November 1 and February 29, 2012, American is offering 50% off award redemptions on Japan Airlines between San Francisco and Tokyo Haneda as well as award redemptions on Japan Airlines between Vancouver and Tokyo Narita. Through this offer a business class award ticket costs 50,000 miles roundtrip and a coach award ticket costs 30,000 miles roundtrip.
This offer applies exclusively to the nonstop flights, so if you need to connect from elsewhere I suspect it will price at the normal award redemptions levels.
As noted by Gary, this is winter in Japan, so I suspect it’s a combination of being the low travel season along with the fact that Japan tourism is way down.