BA 550 then FR 4904 at Fiumicino
London Heathrow → Rome → Palermo
Timetable, Rome time
11:10BA 550 from London Heathrow at the gate
07:50FR 4904 to Palermo leaves the gate
20 h 40 apart on the timetable, overnight
FR 4904 leaves 20 h 40 after BA 550 arrives on the timetable: more than half a day, so not a connection we count.