VA 8311 then IB 4975 at San Francisco
Boston → San Francisco → New York JFK
Timetable, San Francisco time
12:09VA 8311 from Boston at the gate
12:08IB 4975 to New York JFK leaves the gate
23 h 59 apart on the timetable, overnight
IB 4975 leaves 23 h 59 after VA 8311 arrives on the timetable: more than half a day, so not a connection we count.