UA 506 then B6 616 at San Francisco
Raleigh-Durham → San Francisco → New York JFK
Timetable, San Francisco time
11:19UA 506 from Raleigh-Durham at the gatealso VA 8587, NZ 9559
23:58B6 616 to New York JFK leaves the gatealso SQ 1491, EY 8242
12 h 39 apart on the timetable
B6 616 leaves 12 h 39 after UA 506 arrives on the timetable: more than half a day, so not a connection we count.