B6 333 then UA 630 at San Francisco
Boston → San Francisco → Chicago O'Hare
Timetable, San Francisco time
00:25B6 333 from Boston at the gatealso FI 7897, EY 8015, EY 8328
12:27UA 630 to Chicago O'Hare leaves the gatealso AC 5384, VA 8102, NZ 9305
12 h 02 apart on the timetable
UA 630 leaves 12 h 02 after B6 333 arrives on the timetable: more than half a day, so not a connection we count.