The sale is only for October 15 and 16 for travel from November 16, 2015 through August 31, 2016 (although blackout dates apply on some routings).
This is a great chance to fly the BA A380 or 787 product!
The sale applies on British Airways code-shared flights operated by American Airlines. (although given the choice between BA and American…)
You can reduce the cost by booking through AARP. Membership is only $16 and gives you an extra $400 off Business Class.