FR 4892 then OS 554 at Fiumicino
Catania → Rome → Vienna
Timetable, Rome time
16:50FR 4892 from Catania at the gate
15:05OS 554 to Vienna leaves the gate
22 h 15 apart on the timetable, overnight
OS 554 leaves 22 h 15 after FR 4892 arrives on the timetable: more than half a day, so not a connection we count.