OS 551 then FR 4856 at Fiumicino
Vienna → Rome → Catania
Timetable, Rome time
09:25OS 551 from Vienna at the gate
08:25FR 4856 to Catania leaves the gate
23 h apart on the timetable, overnight
FR 4856 leaves 23 h after OS 551 arrives on the timetable: more than half a day, so not a connection we count.