DL 2919 then B6 616 at San Francisco
Boston → San Francisco → New York JFK
Timetable, San Francisco time
23:31DL 2919 from Boston at the gatealso SK 3585, AF 3726, LA 6228
22:56B6 616 to New York JFK leaves the gatealso EY 8046, EY 8242, EY 8246, JU 8513
23 h 25 apart on the timetable, overnight
B6 616 leaves 23 h 25 after DL 2919 arrives on the timetable: more than half a day, so not a connection we count.