AZ 1678 then FR 4858 at Fiumicino
Firenze → Rome → Catania
Timetable, Rome time
12:20AZ 1678 from Firenze at the gate
05:45FR 4858 to Catania leaves the gate
17 h 25 apart on the timetable, overnight
FR 4858 leaves 17 h 25 after AZ 1678 arrives on the timetable: more than half a day, so not a connection we count.