I realize this is pretty obscure, and I won't be all that surprised if I get zero responses to this.
As a kid growing up near YQT in the 80's, I travelled pretty frequently to YYZ to visit family, and in the wintertime, driving was out of the question. I probably flew the YQT-YYZ-YQT route 3-4 times a year, and though I was fascinated by aviation even then, I can't remember what sort of equipment was used on the route. I would suspect it was DC-9s, 737s, and perhaps F28s - it certainly was all on narrowbody aircraft.
One Christmas, we went to fly to YYZ, and our aircraft was much larger than usual.. when we boarded, it was in a 2-3-2 configuration - a Boeing 767. Even today I'd be pretty pumped about my narrowbody being upgraded to a 767, and as a kid I was practically bouncing off the overhead bins about my first flight on a widebody. My mom was a travel agent at the time, and she said she'd do some digging to try to figure out why this happened - later, she told me that AC substituted the larger aircraft due to higher loads in the Christmas season.
My memory of this is really, really foggy, and it's possible that this is just some sort of childhood dream or something. The question: Did this really happen? I dug around as best I could and couldn't find anything supporting this. YQT has never, ever had regularly scheduled widebody service of any kind, and I would suspect that you could count on your fingers the number of times a widebody has ever visited YQT. Did AC ever have a practice of substituting widebodies on routes as minor as YQT-YYZ during peak-demand seasons?
Thanks for any insight into this.