there was a movie just north of Toronto at Maple in a rocquarry, stared Kristoffer Kristian Kristofferson , Cheryl Ladd, Millennium (1989 film)
http://en.wikipedia.org/wiki/Millennium_(1989_film)
i remember the truck carrying the airplane parts going past my grandmothers apartment in Toronto, near the Base , i think even part of the movie was shot on base in one of the hangers. so it is very possbile you saw airplane parts from a movie, or from one of the aircraft plants in the Toronto area. I am sure it could be anything, including military parts but chances of figuring it out without pictures is very slim.
my guess it is the first of the repalcement aircraft for the CF 18, the Canadian made sleath plane.
good luck in finding it again, it is parked next to the arrow in the top secret hang near the ^^^^^^^ sorry i am not allowed to say where the hanger is but look for guys with long hair, ear rings, and non Canadian issued ray guns gaurding the hanger and you will have found its hiding place......some where near a air port would be my guess