AA 1204 then K4 578 at O'Hare
Miami → Chicago → Seoul
Timetable, Chicago time
07:42AA 1204 from Miami at the gate
07:40K4 578 to Seoul leaves the gate
23 h 58 apart on the timetable, overnight
K4 578 leaves 23 h 58 after AA 1204 arrives on the timetable: more than half a day, so not a connection we count.