AA 3437 then K4 578 at O'Hare
Rochester (ROC) → Chicago → Seoul
Timetable, Chicago time
12:40AA 3437 from Rochester (ROC) at the gate
07:40K4 578 to Seoul leaves the gate
19 h apart on the timetable, overnight
K4 578 leaves 19 h after AA 3437 arrives on the timetable: more than half a day, so not a connection we count.