AA 1243 then KJ 2811 at LAX
Boston → Los Angeles → Seoul
Timetable, Los Angeles time
12:32AA 1243 from Boston at the gate
10:40KJ 2811 to Seoul leaves the gate
22 h 08 apart on the timetable, overnight
KJ 2811 leaves 22 h 08 after AA 1243 arrives on the timetable: more than half a day, so not a connection we count.