I'd like to go to Athens from JFK in mid-June of this year. By default, the AAdvantage website auto-routes me through London-Heathrow to get there, which has KILLER taxes (~$700 r/t). Looking through oneworld partners, I do see there is a shared AA-Iberia flight that goes JFK-MAD-ATH. But when I manually try and force the AAdvantage website to go that route via multi-city, it fails. It finds JFK-MAD no problem. But MAD-ATH everything is grayed out. What do you all recommend for finding award availability for JFK-MAD-ATH? Thanks!