KE 81 then DL 5638 at JFK
Seoul → New York → Milwaukee
Timetable, New York time
10:00KE 81 from Seoul at the gate
22:19DL 5638 to Milwaukee leaves the gate
12 h 19 apart on the timetable
DL 5638 leaves 12 h 19 after KE 81 arrives on the timetable: more than half a day, so not a connection we count.