AA 2570 then K4 524 at O'Hare
Salt Lake City → Chicago → Seoul
Timetable, Chicago time
21:55AA 2570 from Salt Lake City at the gate
19:50K4 524 to Seoul leaves the gate
21 h 55 apart on the timetable, overnight
K4 524 leaves 21 h 55 after AA 2570 arrives on the timetable: more than half a day, so not a connection we count.