A3 550 then FR 4852 at Fiumicino
Thessaloniki → Rome → Catania
Timetable, Rome time
19:00A3 550 from Thessaloniki at the gate
13:55FR 4852 to Catania leaves the gate
18 h 55 apart on the timetable, overnight
FR 4852 leaves 18 h 55 after A3 550 arrives on the timetable: more than half a day, so not a connection we count.