AA 4504 then UA 4170 at O'Hare
South Bend → Chicago → Greensboro
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
14:05UA 4170 to Greensboro leaves the gate
19 h 30 apart on the timetable, overnight
UA 4170 leaves 19 h 30 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.