UA 2356 then B6 1323 at Boston
San Francisco → Boston → Santiago (Dominican Republic)
Timetable, Boston time
19:19UA 2356 from San Francisco at the gate
18:55B6 1323 to Santiago (Dominican Republic) leaves the gate
23 h 36 apart on the timetable, overnight
B6 1323 leaves 23 h 36 after UA 2356 arrives on the timetable: more than half a day, so not a connection we count.