AA 4504 then UA 1879 at O'Hare
South Bend → Chicago → San Jose del Cabo
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
09:03UA 1879 to San Jose del Cabo leaves the gate
14 h 28 apart on the timetable, overnight
UA 1879 leaves 14 h 28 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.