AA 990 then UA 3916 at O'Hare
Phoenix → Chicago → New Orleans
Timetable, Chicago time
11:39AA 990 from Phoenix at the gate
07:00UA 3916 to New Orleans leaves the gate
19 h 21 apart on the timetable, overnight
UA 3916 leaves 19 h 21 after AA 990 arrives on the timetable: more than half a day, so not a connection we count.