DL 1091 then DL 670 at San Francisco
Salt Lake City → San Francisco → New York JFK
Timetable, San Francisco time
23:59DL 1091 from Salt Lake City at the gatealso VS 4542
22:25DL 670 to New York JFK leaves the gatealso AM 4305, LY 4444, VS 4848, LA 6189, KQ 7055
22 h 26 apart on the timetable, overnight
DL 670 leaves 22 h 26 after DL 1091 arrives on the timetable: more than half a day, so not a connection we count.