AZ 1712 then U2 1684 at Fiumicino
Catania → Rome → Nice
Timetable, Rome time
20:40AZ 1712 from Catania 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 1712 arrives on the timetable: more than half a day, so not a connection we count.