FR 2540 then IB 307 at Madrid
Bucharest → Madrid → Mexico City
Timetable, Madrid time
13:55FR 2540 from Bucharest at the gate
13:25IB 307 to Mexico City leaves the gatealso CX 1778, BA 4275, QR 5068, AY 5552, EI 5875, LY 9233
23 h 30 apart on the timetable, overnight
IB 307 leaves 23 h 30 after FR 2540 arrives on the timetable: more than half a day, so not a connection we count.