AA 1910 then UA 6080 at O'Hare
Cancún → Chicago → Saginaw
Timetable, Chicago time
16:32AA 1910 from Cancún at the gate
13:25UA 6080 to Saginaw leaves the gate
20 h 53 apart on the timetable, overnight
UA 6080 leaves 20 h 53 after AA 1910 arrives on the timetable: more than half a day, so not a connection we count.