UA 405 then DL 991 at LAX
Denver → Los Angeles → New York JFK
Timetable, Los Angeles time
11:29UA 405 from Denver at the gate
11:25DL 991 to New York JFK leaves the gate
23 h 56 apart on the timetable, overnight
DL 991 leaves 23 h 56 after UA 405 arrives on the timetable: more than half a day, so not a connection we count.