UA 3908 then AA 4379 at O'Hare
Columbus (Ohio) → Chicago → Grand Rapids
Timetable, Chicago time
09:34UA 3908 from Columbus (Ohio) at the gate
22:35AA 4379 to Grand Rapids leaves the gate
13 h 01 apart on the timetable
AA 4379 leaves 13 h 01 after UA 3908 arrives on the timetable: more than half a day, so not a connection we count.