MU 4975 then AR 1133 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
21:30AR 1133 to Buenos Aires leaves the gate
23 h 15 apart on the timetable, overnight
AR 1133 leaves 23 h 15 after MU 4975 arrives on the timetable: more than half a day, so not a connection we count.