AA 4649 then UA 3916 at O'Hare
Pittsburgh → Chicago → New Orleans
Timetable, Chicago time
10:55AA 4649 from Pittsburgh at the gate
07:00UA 3916 to New Orleans leaves the gate
20 h 05 apart on the timetable, overnight
UA 3916 leaves 20 h 05 after AA 4649 arrives on the timetable: more than half a day, so not a connection we count.