BA 965 then BA 203 at Heathrow
Hamburg → London → Boston
Timetable, London time
21:30BA 965 from Hamburg at the gate
17:00BA 203 to Boston leaves the gate
19 h 30 apart on the timetable, overnight
BA 203 leaves 19 h 30 after BA 965 arrives on the timetable: more than half a day, so not a connection we count.