DL 939 then AA 2603 at JFK
Los Angeles → New York → Miami
Timetable, New York time
20:59DL 939 from Los Angeles at the gate
17:45AA 2603 to Miami leaves the gate
20 h 46 apart on the timetable, overnight
AA 2603 leaves 20 h 46 after DL 939 arrives on the timetable: more than half a day, so not a connection we count.