BA 552 then U2 1684 at Fiumicino
London Heathrow → Rome → Nice
Timetable, Rome time
12:20BA 552 from London Heathrow at the gate
11:35U2 1684 to Nice leaves the gate
23 h 15 apart on the timetable, overnight
U2 1684 leaves 23 h 15 after BA 552 arrives on the timetable: more than half a day, so not a connection we count.