B6 833 then UA 5567 at San Francisco
Boston → San Francisco → Seattle
Timetable, San Francisco time
20:55B6 833 from Boston at the gatealso EY 8011
16:17UA 5567 to Seattle leaves the gatealso EK 6385
19 h 22 apart on the timetable, overnight
UA 5567 leaves 19 h 22 after B6 833 arrives on the timetable: more than half a day, so not a connection we count.