IB 304 then EC 1704 at Madrid
Mexico City → Madrid → Nice
Timetable, Madrid time
06:00IB 304 from Mexico City at the gatealso CX 1779
21:20EC 1704 to Nice leaves the gate
15 h 20 apart on the timetable
EC 1704 leaves 15 h 20 after IB 304 arrives on the timetable: more than half a day, so not a connection we count.