U2 1683 then FR 4852 at Fiumicino
Nice → Rome → Catania
Timetable, Rome time
11:50U2 1683 from Nice at the gate
09:35FR 4852 to Catania leaves the gate
21 h 45 apart on the timetable, overnight
FR 4852 leaves 21 h 45 after U2 1683 arrives on the timetable: more than half a day, so not a connection we count.