B6 1621 then DL 5829 at Boston
London → Boston → Newark
Timetable, Boston time
12:15B6 1621 from London at the gate
12:00DL 5829 to Newark leaves the gate
23 h 45 apart on the timetable, overnight
DL 5829 leaves 23 h 45 after B6 1621 arrives on the timetable: more than half a day, so not a connection we count.