BA 554 then FR 4861 at Fiumicino
London Heathrow → Rome → Catania
Timetable, Rome time
14:55BA 554 from London Heathrow at the gate
12:50FR 4861 to Catania leaves the gate
21 h 55 apart on the timetable, overnight
FR 4861 leaves 21 h 55 after BA 554 arrives on the timetable: more than half a day, so not a connection we count.