UA 6104 then AA 320 at O'Hare
YIP → Chicago → Philadelphia
Timetable, Chicago time
20:00UA 6104 from YIP at the gate
08:30AA 320 to Philadelphia leaves the gate
12 h 30 apart on the timetable, overnight
AA 320 leaves 12 h 30 after UA 6104 arrives on the timetable: more than half a day, so not a connection we count.