LA 6139 then AC 5432 at San Francisco
Boston → San Francisco → Chicago O'Hare
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
22:45AC 5432 to Chicago O'Hare leaves the gatealso NZ 9303
22 h 47 apart on the timetable, overnight
AC 5432 leaves 22 h 47 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.