AA 1799 then AA 1715 at O'Hare
Cancún → Chicago → Austin
Timetable, Chicago time
19:20AA 1799 from Cancún at the gate
19:00AA 1715 to Austin leaves the gate
23 h 40 apart on the timetable, overnight
AA 1715 leaves 23 h 40 after AA 1799 arrives on the timetable: more than half a day, so not a connection we count.