UA 1734 then DL 972 at LAX
Washington → Los Angeles → New York JFK
Timetable, Los Angeles time
11:14UA 1734 from Washington at the gate
08:25DL 972 to New York JFK leaves the gate
21 h 11 apart on the timetable, overnight
DL 972 leaves 21 h 11 after UA 1734 arrives on the timetable: more than half a day, so not a connection we count.