BA 1485 then BA 239 at Heathrow
Glasgow → London → Boston
Timetable, London time
19:25BA 1485 from Glasgow at the gate
19:10BA 239 to Boston leaves the gate
23 h 45 apart on the timetable, overnight
BA 239 leaves 23 h 45 after BA 1485 arrives on the timetable: more than half a day, so not a connection we count.