IB 756 then CX 1751 at Madrid
Düsseldorf → Madrid → Buenos Aires
Timetable, Madrid time
22:15IB 756 from Düsseldorf at the gatealso LA 1622, VY 5081, BT 5173, AA 8847
12:20CX 1751 to Buenos Aires leaves the gatealso BA 4255, AY 5375
14 h 05 apart on the timetable, overnight
CX 1751 leaves 14 h 05 after IB 756 arrives on the timetable: more than half a day, so not a connection we count.