VA 8520 then CX 7996 at San Francisco
Boston → San Francisco → Seattle
Timetable, San Francisco time
12:49VA 8520 from Boston at the gate
10:39CX 7996 to Seattle leaves the gate
21 h 50 apart on the timetable, overnight
CX 7996 leaves 21 h 50 after VA 8520 arrives on the timetable: more than half a day, so not a connection we count.