WN 2971 then B6 819 at Detroit
Nashville → Detroit → New York JFK
Timetable, Detroit time
19:35WN 2971 from Nashville at the gate
18:59B6 819 to New York JFK leaves the gate
23 h 24 apart on the timetable, overnight
B6 819 leaves 23 h 24 after WN 2971 arrives on the timetable: more than half a day, so not a connection we count.