BA 879 then AA 731 at Heathrow
Bucharest → London → Charlotte
Timetable, London time
10:10BA 879 from Bucharest at the gate
09:55AA 731 to Charlotte leaves the gate
23 h 45 apart on the timetable, overnight
AA 731 leaves 23 h 45 after BA 879 arrives on the timetable: more than half a day, so not a connection we count.