AA 4504 then UA 224 at O'Hare
South Bend → Chicago → Bozeman
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
09:07UA 224 to Bozeman leaves the gate
14 h 32 apart on the timetable, overnight
UA 224 leaves 14 h 32 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.