DL 5680 then B6 1620 at Boston
Pittsburgh → Boston → London
Timetable, Boston time
20:47DL 5680 from Pittsburgh at the gate
19:10B6 1620 to London leaves the gate
22 h 23 apart on the timetable, overnight
B6 1620 leaves 22 h 23 after DL 5680 arrives on the timetable: more than half a day, so not a connection we count.