AZ 1754 then U2 1684 at Fiumicino
Catania → Rome → Nice
Timetable, Rome time
17:55AZ 1754 from Catania at the gate
14:45U2 1684 to Nice leaves the gate
20 h 50 apart on the timetable, overnight
U2 1684 leaves 20 h 50 after AZ 1754 arrives on the timetable: more than half a day, so not a connection we count.