UA 923 then BA 366 at Heathrow
Los Angeles → London → Marseille
Timetable, London time
13:30UA 923 from Los Angeles at the gate
13:25BA 366 to Marseille leaves the gate
23 h 55 apart on the timetable, overnight
BA 366 leaves 23 h 55 after UA 923 arrives on the timetable: more than half a day, so not a connection we count.