FR 4855 then U2 2971 at Fiumicino
Catania → Rome → Zurich
Timetable, Rome time
23:59FR 4855 from Catania at the gate
19:40U2 2971 to Zurich leaves the gate
19 h 41 apart on the timetable, overnight
U2 2971 leaves 19 h 41 after FR 4855 arrives on the timetable: more than half a day, so not a connection we count.