LX 1952 then IB 2603 at Barcelona
Zurich → Barcelona → Buenos Aires
Timetable, Barcelona time
09:05LX 1952 from Zurich at the gate
08:20IB 2603 to Buenos Aires leaves the gatealso LL 2603, AY 5353, QR 6953
23 h 15 apart on the timetable, overnight
IB 2603 leaves 23 h 15 after LX 1952 arrives on the timetable: more than half a day, so not a connection we count.