B6 833 then CX 7858 at San Francisco
Boston → San Francisco → Seattle
Timetable, San Francisco time
13:16B6 833 from Boston at the gatealso FI 7969
08:33CX 7858 to Seattle leaves the gate
19 h 17 apart on the timetable, overnight
CX 7858 leaves 19 h 17 after B6 833 arrives on the timetable: more than half a day, so not a connection we count.