The one in ZRH. Actually when I called the AA Plt desk she said that I could use the "Swissport Oasis" Lounge while in ZRH for both the outbound and the return. When I asked her about using the Allegra Lounge as an arrivals lounge she said she saw no mention of it.

But after reading these threads...

Zurich Lounge Advice

Admirals Club in ZRH?

ZRH and ORD Lounge Questions

...it seems I should give the Allegra Lounge a shot when I arrive in ZRH (I'm there for 3 hours anyway, so if I don't get in I'll just go where AA directs me). And the consensus seems to be to use the ZRH Swissport Lounge on my return.

For background, I'm AA Plt, not checking luggage, flying LAX-JFK-ZRH on AA metal in C class and continuing on to ZRH-FCO on AA numbered Swiss codeshare in coach. (And I'll use the AC's at LAX and JFK).

Andrzej, I'm not sure if I followed your comment above to InterflugIL62...do you think getting into the Allegra Lounge will be dicey?