B6 1888 then B6 1603 at JFK
Washington National → New York → San Juan
Timetable, New York time
07:27B6 1888 from Washington National at the gate
19:30B6 1603 to San Juan leaves the gate
12 h 03 apart on the timetable
B6 1603 leaves 12 h 03 after B6 1888 arrives on the timetable: more than half a day, so not a connection we count.