Woot. I Just booked BOS-LHR-BOS for this weekend @ 405.50ai. There were some options at 350ai but it requires an overnight in AMS and I cant take monday off. For BOS, I'm not sure if its a mistake or a promo due to the new London routes. I found an article on boston.com that states $400 round trip intro rate but it doesnt specify if its AI or not