AC 7055 then AC 858 at Toronto Pearson
Montréal → Toronto → London Heathrow
Timetable, Toronto time
08:35AC 7055 from Montréal at the gate
23:00AC 858 to London Heathrow leaves the gate
14 h 25 apart on the timetable
AC 858 leaves 14 h 25 after AC 7055 arrives on the timetable: more than half a day, so not a connection we count.