AZ 721 then U2 1684 at Fiumicino
Athens → Rome → Nice
Timetable, Rome time
20:40AZ 721 from Athens at the gate
14:45U2 1684 to Nice leaves the gate
18 h 05 apart on the timetable, overnight
U2 1684 leaves 18 h 05 after AZ 721 arrives on the timetable: more than half a day, so not a connection we count.