Hello @ SaharaMan,
thank you for sharing your question with us and welcome to Wefugees. Wefugees is a Germany based platform and our experts fare focussing on German laws because questions within the realms of German laws are paramount here.
As far as i know, unlike Germany there is no airport procedure (=transit zone procedure) in Canada, The Canadian law makes provisions for the asylum prodedure when you reach a port of entry. A transit zone, as you commented yourself, isn't such a point, so it's improbable that you can apply for asylum there.
I'd like to draw your attention a very informative Canadian website: ****://***.lawfacts.ca/refugee/claim/poe. I hope this page will answer some questions.