UA 3911 then AA 4307 at O'Hare
Portland (Oregon) → Chicago → Traverse City
Timetable, Chicago time
17:09UA 3911 from Portland (Oregon) at the gate
11:57AA 4307 to Traverse City leaves the gate
18 h 48 apart on the timetable, overnight
AA 4307 leaves 18 h 48 after UA 3911 arrives on the timetable: more than half a day, so not a connection we count.