AA 4448 then DL 747 at JFK
Boston → New York → Los Angeles
Timetable, New York time
14:10AA 4448 from Boston at the gate
11:00DL 747 to Los Angeles leaves the gate
20 h 50 apart on the timetable, overnight
DL 747 leaves 20 h 50 after AA 4448 arrives on the timetable: more than half a day, so not a connection we count.