BA 212 then BA 974 at Heathrow
Boston → London → Berlin
Timetable, London time
06:15BA 212 from Boston at the gate
06:05BA 974 to Berlin leaves the gate
23 h 50 apart on the timetable, overnight
BA 974 leaves 23 h 50 after BA 212 arrives on the timetable: more than half a day, so not a connection we count.