AA 1353 then K4 578 at O'Hare
San Francisco → Chicago → Seoul
Timetable, Chicago time
13:44AA 1353 from San Francisco at the gate
07:40K4 578 to Seoul leaves the gate
17 h 56 apart on the timetable, overnight
K4 578 leaves 17 h 56 after AA 1353 arrives on the timetable: more than half a day, so not a connection we count.