AA 4757 then UA 3916 at O'Hare
Pittsburgh → Chicago → New Orleans
Timetable, Chicago time
14:02AA 4757 from Pittsburgh at the gate
07:00UA 3916 to New Orleans leaves the gate
16 h 58 apart on the timetable, overnight
UA 3916 leaves 16 h 58 after AA 4757 arrives on the timetable: more than half a day, so not a connection we count.