AZ 641 then FR 4861 at Fiumicino
San Francisco → Rome → Catania
Timetable, Rome time
12:15AZ 641 from San Francisco at the gate
09:15FR 4861 to Catania leaves the gate
21 h apart on the timetable, overnight
FR 4861 leaves 21 h after AZ 641 arrives on the timetable: more than half a day, so not a connection we count.