AA 1910 then UA 4772 at O'Hare
Cancún → Chicago → Columbia Regional
Timetable, Chicago time
16:29AA 1910 from Cancún at the gate
12:45UA 4772 to Columbia Regional leaves the gate
20 h 16 apart on the timetable, overnight
UA 4772 leaves 20 h 16 after AA 1910 arrives on the timetable: more than half a day, so not a connection we count.