AA 4504 then UA 5819 at O'Hare
South Bend → Chicago → Duluth
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
08:42UA 5819 to Duluth leaves the gate
14 h 07 apart on the timetable, overnight
UA 5819 leaves 14 h 07 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.