FR 4855 then FR 3946 at Fiumicino
Catania → Rome → Palermo
Timetable, Rome time
17:10FR 4855 from Catania at the gate
13:50FR 3946 to Palermo leaves the gate
20 h 40 apart on the timetable, overnight
FR 3946 leaves 20 h 40 after FR 4855 arrives on the timetable: more than half a day, so not a connection we count.