OS 557 then FR 4852 at Fiumicino
Vienna → Rome → Catania
Timetable, Rome time
19:15OS 557 from Vienna at the gate
13:55FR 4852 to Catania leaves the gate
18 h 40 apart on the timetable, overnight
FR 4852 leaves 18 h 40 after OS 557 arrives on the timetable: more than half a day, so not a connection we count.