VA 8311 then DL 668 at San Francisco
Boston → San Francisco → New York JFK
Timetable, San Francisco time
11:54VA 8311 from Boston at the gate
11:45DL 668 to New York JFK leaves the gatealso UX 3429, LY 4440, VS 4762, LA 6225, LA 6342, KL 7014, KL 7260
23 h 51 apart on the timetable, overnight
DL 668 leaves 23 h 51 after VA 8311 arrives on the timetable: more than half a day, so not a connection we count.