OS 554 then FR 1565 at Vienna
Rome → Vienna → Catania
Timetable, Vienna time
16:45OS 554 from Rome at the gate
13:55FR 1565 to Catania leaves the gate
21 h 10 apart on the timetable, overnight
FR 1565 leaves 21 h 10 after OS 554 arrives on the timetable: more than half a day, so not a connection we count.