AF 1517 then U2 4501 at Charles de Gaulle
Porto → Paris → Nice
Timetable, Paris time
09:20AF 1517 from Porto at the gate
06:55U2 4501 to Nice leaves the gate
21 h 35 apart on the timetable, overnight
U2 4501 leaves 21 h 35 after AF 1517 arrives on the timetable: more than half a day, so not a connection we count.