OS 553 then FR 4891 at Fiumicino
Vienna → Rome → Catania
Timetable, Rome time
14:15OS 553 from Vienna at the gate
12:15FR 4891 to Catania leaves the gate
22 h apart on the timetable, overnight
FR 4891 leaves 22 h after OS 553 arrives on the timetable: more than half a day, so not a connection we count.