BA 190 then BA 874 at Heathrow
Austin → London → Bucharest
Timetable, London time
10:05BA 190 from Austin at the gate
09:50BA 874 to Bucharest leaves the gate
23 h 45 apart on the timetable, overnight
BA 874 leaves 23 h 45 after BA 190 arrives on the timetable: more than half a day, so not a connection we count.