QR 3752 then IB 2603 at Barcelona
Nice → Barcelona → Buenos Aires
Timetable, Barcelona time
10:15QR 3752 from Nice at the gatealso IB 5475, LA 5805, VY 8135
08:20IB 2603 to Buenos Aires leaves the gatealso LL 2603, AY 5353, QR 6953
22 h 05 apart on the timetable, overnight
IB 2603 leaves 22 h 05 after QR 3752 arrives on the timetable: more than half a day, so not a connection we count.