DL 1147 then AA 2389 at O'Hare
Atlanta → Chicago → Calgary
Timetable, Chicago time
10:25DL 1147 from Atlanta at the gate
10:00AA 2389 to Calgary leaves the gate
23 h 35 apart on the timetable, overnight
AA 2389 leaves 23 h 35 after DL 1147 arrives on the timetable: more than half a day, so not a connection we count.