BA 359 then AC 861 at Heathrow
Lyon → London → Vancouver
Timetable, London time
14:40BA 359 from Lyon at the gate
14:30AC 861 to Vancouver leaves the gate
23 h 50 apart on the timetable, overnight
AC 861 leaves 23 h 50 after BA 359 arrives on the timetable: more than half a day, so not a connection we count.