AA 880 then UA 3916 at O'Hare
Philadelphia → Chicago → New Orleans
Timetable, Chicago time
12:19AA 880 from Philadelphia at the gate
07:00UA 3916 to New Orleans leaves the gate
18 h 41 apart on the timetable, overnight
UA 3916 leaves 18 h 41 after AA 880 arrives on the timetable: more than half a day, so not a connection we count.