OS 557 then FR 4861 at Fiumicino
Vienna → Rome → Catania
Timetable, Rome time
19:15OS 557 from Vienna at the gate
19:00FR 4861 to Catania leaves the gate
23 h 45 apart on the timetable, overnight
FR 4861 leaves 23 h 45 after OS 557 arrives on the timetable: more than half a day, so not a connection we count.