AA 6298 then K4 578 at O'Hare
Cedar Rapids → Chicago → Seoul
Timetable, Chicago time
13:50AA 6298 from Cedar Rapids at the gate
07:40K4 578 to Seoul leaves the gate
17 h 50 apart on the timetable, overnight
K4 578 leaves 17 h 50 after AA 6298 arrives on the timetable: more than half a day, so not a connection we count.