B6 1034 then AC 7668 at Boston
San Francisco → Boston → Halifax
Timetable, Boston time
20:59B6 1034 from San Francisco at the gate
18:25AC 7668 to Halifax leaves the gate
21 h 26 apart on the timetable, overnight
AC 7668 leaves 21 h 26 after B6 1034 arrives on the timetable: more than half a day, so not a connection we count.