DL 939 then DL 138 at JFK
Los Angeles → New York → Porto
Timetable, New York time
20:59DL 939 from Los Angeles at the gate
20:30DL 138 to Porto leaves the gate
23 h 31 apart on the timetable, overnight
DL 138 leaves 23 h 31 after DL 939 arrives on the timetable: more than half a day, so not a connection we count.