BA 175 then DL 5595 at JFK
London Heathrow → New York → Washington
Timetable, New York time
12:35BA 175 from London Heathrow at the gate
10:25DL 5595 to Washington leaves the gate
21 h 50 apart on the timetable, overnight
DL 5595 leaves 21 h 50 after BA 175 arrives on the timetable: more than half a day, so not a connection we count.