AA 6212 then K4 578 at O'Hare
Madison → Chicago → Seoul
Timetable, Chicago time
12:55AA 6212 from Madison at the gate
07:40K4 578 to Seoul leaves the gate
18 h 45 apart on the timetable, overnight
K4 578 leaves 18 h 45 after AA 6212 arrives on the timetable: more than half a day, so not a connection we count.