DL 4919 then DL 747 at JFK
Nashville → New York → Los Angeles
Timetable, New York time
13:48DL 4919 from Nashville at the gate
11:00DL 747 to Los Angeles leaves the gate
21 h 12 apart on the timetable, overnight
DL 747 leaves 21 h 12 after DL 4919 arrives on the timetable: more than half a day, so not a connection we count.