VA 8311 then VA 8193 at San Francisco
Boston → San Francisco → Newark
Timetable, San Francisco time
12:09VA 8311 from Boston at the gate
23:15VA 8193 to Newark leaves the gate
11 h 06 apart on the timetable
The last days
VA 8311 and VA 8193 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.