AZ 159 then U2 1684 at Fiumicino
Brussels → Rome → Nice
Timetable, Rome time
13:40AZ 159 from Brussels at the gate
11:35U2 1684 to Nice leaves the gate
21 h 55 apart on the timetable, overnight
U2 1684 leaves 21 h 55 after AZ 159 arrives on the timetable: more than half a day, so not a connection we count.