B6 604 then DL 1428 at JFK
Vancouver → New York → Miami
Timetable, New York time
07:13B6 604 from Vancouver at the gate
19:40DL 1428 to Miami leaves the gate
12 h 27 apart on the timetable
DL 1428 leaves 12 h 27 after B6 604 arrives on the timetable: more than half a day, so not a connection we count.