AA 4343 then B6 515 at JFK
Nashville → New York → San Francisco
Timetable, New York time
21:00AA 4343 from Nashville at the gate
20:15B6 515 to San Francisco leaves the gate
23 h 15 apart on the timetable, overnight
B6 515 leaves 23 h 15 after AA 4343 arrives on the timetable: more than half a day, so not a connection we count.