AA 430 then DL 1428 at JFK
Los Angeles → New York → Miami
Timetable, New York time
06:59AA 430 from Los Angeles at the gate
19:40DL 1428 to Miami leaves the gate
12 h 41 apart on the timetable
DL 1428 leaves 12 h 41 after AA 430 arrives on the timetable: more than half a day, so not a connection we count.