B6 1034 then B6 391 at Boston
San Francisco → Boston → Tampa
Timetable, Boston time
20:59B6 1034 from San Francisco at the gate
15:10B6 391 to Tampa leaves the gate
18 h 11 apart on the timetable, overnight
B6 391 leaves 18 h 11 after B6 1034 arrives on the timetable: more than half a day, so not a connection we count.