BA 349 then AA 135 at Heathrow
Nice → London → Los Angeles
Timetable, London time
21:05BA 349 from Nice at the gate
16:55AA 135 to Los Angeles leaves the gate
19 h 50 apart on the timetable, overnight
AA 135 leaves 19 h 50 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.