DL 1909 then B6 1603 at JFK
Salt Lake City → New York → San Juan
Timetable, New York time
05:00DL 1909 from Salt Lake City at the gate
19:30B6 1603 to San Juan leaves the gate
14 h 30 apart on the timetable
B6 1603 leaves 14 h 30 after DL 1909 arrives on the timetable: more than half a day, so not a connection we count.