AA 4504 then UA 4445 at O'Hare
South Bend → Chicago → Birmingham (Alabama)
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
10:29UA 4445 to Birmingham (Alabama) leaves the gate
15 h 54 apart on the timetable, overnight
UA 4445 leaves 15 h 54 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.