DL 2919 then UA 877 at San Francisco
Boston → San Francisco → Hong Kong
Timetable, San Francisco time
23:31DL 2919 from Boston at the gatealso SK 3585, AF 3726, LA 6228
23:15UA 877 to Hong Kong leaves the gate
23 h 44 apart on the timetable, overnight
UA 877 leaves 23 h 44 after DL 2919 arrives on the timetable: more than half a day, so not a connection we count.