B6 833 then AA 2642 at San Francisco
Boston → San Francisco → Chicago O'Hare
Timetable, San Francisco time
20:55B6 833 from Boston at the gatealso EY 8011
15:18AA 2642 to Chicago O'Hare leaves the gatealso BA 5612, GF 6849
18 h 23 apart on the timetable, overnight
AA 2642 leaves 18 h 23 after B6 833 arrives on the timetable: more than half a day, so not a connection we count.