Susan, have you & Russel booked flights yet?
I found out on Sunday that AA has discontinued their BOS-LHR day flight on Tuesdays for the summer. They booked us BOS-JFK-LHR on 8/11 and then LHR-ATH on 8/12. Of course, airfares had dropped a bit since January when I purchased the tickets, so this was a great opportunity to get a refund & save some money. We are now leaving BOS the evening of 8/10 and will arrive in Athens around 5:30 pm on 8/11, so we'll have 2 full days there.
Even better, I was able to get us business class on the LHR-ATH, IST-LHR flights on BA, and still saved $800 from the original booking!