AA 2386 then UA 5201 at O'Hare
Philadelphia → Chicago → Milwaukee
Timetable, Chicago time
07:25AA 2386 from Philadelphia at the gate
20:00UA 5201 to Milwaukee leaves the gate
12 h 35 apart on the timetable
UA 5201 leaves 12 h 35 after AA 2386 arrives on the timetable: more than half a day, so not a connection we count.