Flying JFK-HEL-BKK on AY (Finnair) in July. Three of us, I'm AA EXP (OW Emerald), and a AA Plat (OW Sapphire). We arrive about 0800 (flying Y) and depart on a non-OW carrier about 1200. I believe we'll have to clear immigration and head to the ticketing area (Bangkok Airways) to get our onward BPs.

Upon re-entry after security will we be granted access to any of the OW lounges to have a shower and clean up since we've just arrived on a OW flight? Any lounge more strict than another CX, JL, or BA/QF?

Thanks