AA 4504 then UA 2182 at O'Hare
South Bend → Chicago → Portland (Oregon)
Timetable, Chicago time
18:35AA 4504 from South Bend at the gate
12:49UA 2182 to Portland (Oregon) leaves the gate
18 h 14 apart on the timetable, overnight
UA 2182 leaves 18 h 14 after AA 4504 arrives on the timetable: more than half a day, so not a connection we count.