FR 1815 then AZ 1745 at Fiumicino
Porto → Rome → Catania
Timetable, Rome time
20:40FR 1815 from Porto at the gate
13:20AZ 1745 to Catania leaves the gate
16 h 40 apart on the timetable, overnight
AZ 1745 leaves 16 h 40 after FR 1815 arrives on the timetable: more than half a day, so not a connection we count.