DL 5860 then B6 1223 at JFK
Washington → New York → Los Angeles
Timetable, New York time
20:00DL 5860 from Washington at the gate
16:48B6 1223 to Los Angeles leaves the gate
20 h 48 apart on the timetable, overnight
B6 1223 leaves 20 h 48 after DL 5860 arrives on the timetable: more than half a day, so not a connection we count.