LA 6139 then UA 60 at San Francisco
Boston → San Francisco → Melbourne
Timetable, San Francisco time
23:58LA 6139 from Boston at the gate
23:35UA 60 to Melbourne leaves the gatealso LX 3086, VA 8002, LH 8920
23 h 37 apart on the timetable, overnight
UA 60 leaves 23 h 37 after LA 6139 arrives on the timetable: more than half a day, so not a connection we count.