DL 5619 then DL 58 at Boston
Milwaukee → Boston → London
Timetable, Boston time
22:02DL 5619 from Milwaukee at the gate
19:15DL 58 to London leaves the gate
21 h 13 apart on the timetable, overnight
DL 58 leaves 21 h 13 after DL 5619 arrives on the timetable: more than half a day, so not a connection we count.