AA 4038 then UA 5191 at O'Hare
Madison → Chicago → Lancaster
Timetable, Chicago time
16:44AA 4038 from Madison at the gate
08:50UA 5191 to Lancaster leaves the gate
16 h 06 apart on the timetable, overnight
UA 5191 leaves 16 h 06 after AA 4038 arrives on the timetable: more than half a day, so not a connection we count.