FR 4851 then OS 554 at Fiumicino
Catania → Rome → Vienna
Timetable, Rome time
00:25FR 4851 from Catania at the gate
15:05OS 554 to Vienna leaves the gate
14 h 40 apart on the timetable
OS 554 leaves 14 h 40 after FR 4851 arrives on the timetable: more than half a day, so not a connection we count.