AC 4121 then KE 24 at San Francisco
Ontario → San Francisco → Seoul
Timetable, San Francisco time
17:50AC 4121 from Ontario at the gate
11:45KE 24 to Seoul leaves the gatealso DL 7861
17 h 55 apart on the timetable, overnight
KE 24 leaves 17 h 55 after AC 4121 arrives on the timetable: more than half a day, so not a connection we count.