Right now British Airways has roundtrip business class travel to London from $US2,015  from  Atlanta, Boston, Chicago,  Los Angeles, New York, San Francisco, and Washington DC. 

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.