UA 2276 then DL 939 at LAX
Washington → Los Angeles → New York JFK
Timetable, Los Angeles time
20:45UA 2276 from Washington at the gate
12:45DL 939 to New York JFK leaves the gate
16 h apart on the timetable, overnight
DL 939 leaves 16 h after UA 2276 arrives on the timetable: more than half a day, so not a connection we count.