AA 2379 then UA 3751 at O'Hare
Seattle (SEA) → Chicago → Cedar Rapids
Timetable, Chicago time
06:05AA 2379 from Seattle (SEA) at the gate
20:10UA 3751 to Cedar Rapids leaves the gate
14 h 05 apart on the timetable
UA 3751 leaves 14 h 05 after AA 2379 arrives on the timetable: more than half a day, so not a connection we count.