B6 1534 then DL 5679 at Boston
San Francisco → Boston → Pittsburgh
Timetable, Boston time
06:44B6 1534 from San Francisco at the gate
18:55DL 5679 to Pittsburgh leaves the gate
12 h 11 apart on the timetable
DL 5679 leaves 12 h 11 after B6 1534 arrives on the timetable: more than half a day, so not a connection we count.