Originally Posted by
UAPremExecflyer
I wouldn't waste your miles on FCO-CDG. There should be plenty of cheap revenue tickets around with one of the LCCs. If you have to, book a round-trip and throw away the backend. As to FCO-ATL, UA flies FCO-IAD-ATL or you could go FCO-FRA-ATL on LH.
the title of the post said FCO-ATL-CDG (not FCO-CDG-ATL, as the body would suggest), but to answer the OP's question another way, the only airline that flies nonstop between FCO and ATL is delta. lufthansa, though, flies direct FRA-ATL, and there is availability in Y on that flight on 12/15 (reports .bomb).