British Airways is currently offering fares from a number of U.S. cities to Dublin in business class for $2,022 roundtrip on many days during the summer.
Additionally AARP members (anyone can join here) receive $400 off British Airways business class tickets. British Airways cardholders also get an additional 10% off with the code CARDOFFERU.
After all discounts, the final price for the ticket should be $1,460. This ticket should also qualify for the American Airlines premium cabin bonus when credited to AAdvantage. With that bonus you would receive an additional 20,000 mile bonus.
For more info, see this One Mile at a Time post.