AC 7041 then AC 864 at Montréal
Washington → Montréal → London Heathrow
Timetable, Montréal time
00:07AC 7041 from Washington at the gate
19:10AC 864 to London Heathrow leaves the gate
19 h 03 apart on the timetable
AC 864 leaves 19 h 03 after AC 7041 arrives on the timetable: more than half a day, so not a connection we count.