DL 939 then DL 5743 at JFK
Los Angeles → New York → Washington National
Timetable, New York time
20:59DL 939 from Los Angeles at the gate
20:55DL 5743 to Washington National leaves the gate
23 h 56 apart on the timetable, overnight
DL 5743 leaves 23 h 56 after DL 939 arrives on the timetable: more than half a day, so not a connection we count.