DL 139 then DL 4944 at JFK
Porto → New York → Burlington
Timetable, New York time
13:20DL 139 from Porto at the gate
12:20DL 4944 to Burlington leaves the gate
23 h apart on the timetable, overnight
DL 4944 leaves 23 h after DL 139 arrives on the timetable: more than half a day, so not a connection we count.