VA 8310 then Y4 2243 at San Francisco
Boston → San Francisco → Dallas-Fort Worth
Timetable, San Francisco time
10:59VA 8310 from Boston at the gate
23:47Y4 2243 to Dallas-Fort Worth leaves the gatealso F9 2930
12 h 48 apart on the timetable
Y4 2243 leaves 12 h 48 after VA 8310 arrives on the timetable: more than half a day, so not a connection we count.