AA 4504 then UA 3494 at O'Hare
South Bend → Chicago → Grand Rapids
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
17:57UA 3494 to Grand Rapids leaves the gate
23 h 22 apart on the timetable, overnight
UA 3494 leaves 23 h 22 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.