AZ 1684 then FR 4861 at Fiumicino
Firenze → Rome → Catania
Timetable, Rome time
19:55AZ 1684 from Firenze at the gate
12:50FR 4861 to Catania leaves the gate
16 h 55 apart on the timetable, overnight
FR 4861 leaves 16 h 55 after AZ 1684 arrives on the timetable: more than half a day, so not a connection we count.