I'm not sure when this started, but flights from Fiumicino on U.S. carriers and on El Al no longer use T5 for check-in. The counters are now in T3 at the far left end of the hall (counter numbers 400 +). Passengers who check in for these flights have a separate security section, as well. My flight on UA this morning left from the E gates (the former G gates). The lounge is still Le Anfore.