UX 4050 then CX 1751 at Madrid
Alicante → Madrid → Buenos Aires
Timetable, Madrid time
21:55UX 4050 from Alicante at the gatealso EY 4300, MU 4973, AM 6816
12:20CX 1751 to Buenos Aires leaves the gatealso BA 4255, AY 5375
14 h 25 apart on the timetable, overnight
CX 1751 leaves 14 h 25 after UX 4050 arrives on the timetable: more than half a day, so not a connection we count.