B6 15 then UA 3900 at San Francisco
New York JFK → San Francisco → Hong Kong
Timetable, San Francisco time
11:08B6 15 from New York JFK at the gatealso TP 4397, LO 5773
07:00UA 3900 to Hong Kong leaves the gate
19 h 52 apart on the timetable, overnight
UA 3900 leaves 19 h 52 after B6 15 arrives on the timetable: more than half a day, so not a connection we count.