AA 470 then UA 5191 at O'Hare
Philadelphia → Chicago → Lancaster
Timetable, Chicago time
17:33AA 470 from Philadelphia at the gate
08:50UA 5191 to Lancaster leaves the gate
15 h 17 apart on the timetable, overnight
UA 5191 leaves 15 h 17 after AA 470 arrives on the timetable: more than half a day, so not a connection we count.