UA 3911 then AA 3490 at O'Hare
Portland (Oregon) → Chicago → Grand Rapids
Timetable, Chicago time
17:09UA 3911 from Portland (Oregon) at the gate
13:40AA 3490 to Grand Rapids leaves the gate
20 h 31 apart on the timetable, overnight
AA 3490 leaves 20 h 31 after UA 3911 arrives on the timetable: more than half a day, so not a connection we count.