CX 99 then K4 578 at O'Hare
New York JFK → Chicago → Seoul
Timetable, Chicago time
17:00CX 99 from New York JFK at the gate
07:40K4 578 to Seoul leaves the gate
14 h 40 apart on the timetable, overnight
K4 578 leaves 14 h 40 after CX 99 arrives on the timetable: more than half a day, so not a connection we count.