JAL often has discount mileage promotions (5,000 to 10,000 miles less) for its partner airlines in economy class.
JAL has now extended promotions it has for US Airways, TAM and LAN economy award flights.
You can access JAL’s web page for these discount campaigns here.
Here are the extended campaigns:
US Airways For Travel Until September 30, 2015
TAM For Travel Until March 31, 2015
LAN For Travel Until March 31, 2016.
You have to bear in mind that JAL allows two stop-overs and maximum of six segments on its partner airline awards. There are no fuel surcharges on travel within the United States and for travel originating from Brazil. Those are good use of JAL miles.