DL 4959 then DL 917 at JFK
Jacksonville → New York → Salt Lake City
Timetable, New York time
10:09DL 4959 from Jacksonville at the gate
09:30DL 917 to Salt Lake City leaves the gate
23 h 21 apart on the timetable, overnight
DL 917 leaves 23 h 21 after DL 4959 arrives on the timetable: more than half a day, so not a connection we count.