UA 626 then B6 316 at San Francisco
Nashville → San Francisco → New York JFK
Timetable, San Francisco time
11:07UA 626 from Nashville at the gatealso VA 8093, NZ 9388
08:05B6 316 to New York JFK leaves the gatealso LO 5774, EY 8328, AT 9559
20 h 58 apart on the timetable, overnight
B6 316 leaves 20 h 58 after UA 626 arrives on the timetable: more than half a day, so not a connection we count.