AA 4504 then UA 535 at O'Hare
South Bend → Chicago → Houston
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
09:21UA 535 to Houston leaves the gate
14 h 46 apart on the timetable, overnight
UA 535 leaves 14 h 46 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.