AA 4504 then UA 1655 at O'Hare
South Bend → Chicago → Miami
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
18:12UA 1655 to Miami leaves the gate
23 h 37 apart on the timetable, overnight
UA 1655 leaves 23 h 37 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.