AA 4618 then DL 508 at Boston
New York JFK → Boston → Los Angeles
Timetable, Boston time
16:57AA 4618 from New York JFK at the gate
16:20DL 508 to Los Angeles leaves the gate
23 h 23 apart on the timetable, overnight
DL 508 leaves 23 h 23 after AA 4618 arrives on the timetable: more than half a day, so not a connection we count.