AA 742 then QR 3669 at Barcelona
Philadelphia → Barcelona → Nice
Timetable, Barcelona time
09:10AA 742 from Philadelphia at the gatealso BA 1607, AY 3814, IB 4934
21:20QR 3669 to Nice leaves the gate
12 h 10 apart on the timetable
QR 3669 leaves 12 h 10 after AA 742 arrives on the timetable: more than half a day, so not a connection we count.