AA 440 then UA 3916 at O'Hare
Houston → Chicago → New Orleans
Timetable, Chicago time
14:29AA 440 from Houston at the gate
07:00UA 3916 to New Orleans leaves the gate
16 h 31 apart on the timetable, overnight
UA 3916 leaves 16 h 31 after AA 440 arrives on the timetable: more than half a day, so not a connection we count.