AC sometimes sends Rouge 763 to clear backlogs when there are a few multiple cancelled flights.
Other operators have flown with birds as big as 747s into YQB, but not anymore. Sometimes, we get visits from heads of states with big equipment as well. I remember seeing the Mexican government 787 a few years ago. Diversions also occur for various reason, there was an LH 343 a couple of years ago that diverted for medical reasons.