AA 519 then UA 5539 at O'Hare
Portland (Oregon) → Chicago → Moline
Timetable, Chicago time
05:07AA 519 from Portland (Oregon) at the gate
21:47UA 5539 to Moline leaves the gate
16 h 40 apart on the timetable
UA 5539 leaves 16 h 40 after AA 519 arrives on the timetable: more than half a day, so not a connection we count.