AA 3546 then UA 3916 at O'Hare
Detroit → Chicago → New Orleans
Timetable, Chicago time
11:00AA 3546 from Detroit at the gate
07:00UA 3916 to New Orleans leaves the gate
20 h apart on the timetable, overnight
UA 3916 leaves 20 h after AA 3546 arrives on the timetable: more than half a day, so not a connection we count.