UA 3904 then DL 977 at San Francisco
Honolulu → San Francisco → Boston
Timetable, San Francisco time
13:43UA 3904 from Honolulu at the gate
12:55DL 977 to Boston leaves the gatealso KE 6731
23 h 12 apart on the timetable, overnight
DL 977 leaves 23 h 12 after UA 3904 arrives on the timetable: more than half a day, so not a connection we count.