I am sorry, I misunderstood your question:
- The AirOne welcome lounge in FCO (terminal A) is available for departure only on AirOne flights. Most of the employees I have come into are unaware that US *G passengers are given access but if they look up in their folder they have a memo in there. This is not a general *G lounge, and US *S doesn't have access to it.
- Other *A carriers that leave from Terminal B (LH, OS,...): They give *G an invitation for the Aeroporti di Roma lounge when flying on their own flights;
- Other *A carriers that leave from Terminal C (US, AC): Only AC *G flying on AC are permitted access to the mini-lounge at that terminal; US Envoy passengers are given an invitation to access the Mosaici lounge, no *G access. TG *G have a special agreement at that same lounge for access.