DL 1780 then DL 445 at Boston
San Juan → Boston → Salt Lake City
Timetable, Boston time
18:15DL 1780 from San Juan at the gate
16:15DL 445 to Salt Lake City leaves the gate
22 h apart on the timetable, overnight
DL 445 leaves 22 h after DL 1780 arrives on the timetable: more than half a day, so not a connection we count.