TS 427 then AC 7170 at Toronto Pearson
Cancún → Toronto → Montréal
Timetable, Toronto time
00:25TS 427 from Cancún at the gate
13:00AC 7170 to Montréal leaves the gate
12 h 35 apart on the timetable
AC 7170 leaves 12 h 35 after TS 427 arrives on the timetable: more than half a day, so not a connection we count.