AA 4504 then AM 687 at O'Hare
South Bend → Chicago → Mexico City
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
15:26AM 687 to Mexico City leaves the gate
20 h 51 apart on the timetable, overnight
AM 687 leaves 20 h 51 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.