BA 371 then AA 137 at Heathrow
Toulouse → London → Los Angeles
Timetable, London time
13:15BA 371 from Toulouse at the gate
11:55AA 137 to Los Angeles leaves the gate
22 h 40 apart on the timetable, overnight
AA 137 leaves 22 h 40 after BA 371 arrives on the timetable: more than half a day, so not a connection we count.