AA 4001 then K4 578 at O'Hare
Minneapolis → Chicago → Seoul
Timetable, Chicago time
10:36AA 4001 from Minneapolis at the gate
07:40K4 578 to Seoul leaves the gate
21 h 04 apart on the timetable, overnight
K4 578 leaves 21 h 04 after AA 4001 arrives on the timetable: more than half a day, so not a connection we count.