B6 615 then B6 1534 at San Francisco
New York JFK → San Francisco → Boston
Timetable, San Francisco time
22:42B6 615 from New York JFK at the gatealso EY 8389
22:10B6 1534 to Boston leaves the gate
23 h 28 apart on the timetable, overnight
B6 1534 leaves 23 h 28 after B6 615 arrives on the timetable: more than half a day, so not a connection we count.