MU 4975 then CX 1751 at Madrid
Bilbao → Madrid → Buenos Aires
Timetable, Madrid time
22:15MU 4975 from Bilbao at the gatealso AM 6899, AD 6940, UX 7160, EY 7546
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 MU 4975 arrives on the timetable: more than half a day, so not a connection we count.