AA 9950 then AA 6212 at O'Hare
Philadelphia → Chicago → Madison
Timetable, Chicago time
13:49AA 9950 from Philadelphia at the gate
09:45AA 6212 to Madison leaves the gate
19 h 56 apart on the timetable, overnight
AA 6212 leaves 19 h 56 after AA 9950 arrives on the timetable: more than half a day, so not a connection we count.