AA 764 then UA 3916 at O'Hare
Houston → Chicago → New Orleans
Timetable, Chicago time
11:58AA 764 from Houston at the gate
07:00UA 3916 to New Orleans leaves the gate
19 h 02 apart on the timetable, overnight
UA 3916 leaves 19 h 02 after AA 764 arrives on the timetable: more than half a day, so not a connection we count.