DL 939 then AA 4463 at JFK
Los Angeles → New York → Washington National
Timetable, New York time
20:59DL 939 from Los Angeles at the gate
17:59AA 4463 to Washington National leaves the gate
21 h apart on the timetable, overnight
AA 4463 leaves 21 h after DL 939 arrives on the timetable: more than half a day, so not a connection we count.