BA 349 then BA 67 at Heathrow
Nice → London → Philadelphia
Timetable, London time
14:05BA 349 from Nice at the gate
13:10BA 67 to Philadelphia leaves the gate
23 h 05 apart on the timetable, overnight
BA 67 leaves 23 h 05 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.