Airline will do nothing.
However, immigration officers are not stupid. They are aware of economic situation in Spain Greece etc. Many people try what you do and are refused entry at airport.
You can expect extra questions, they will investigate why you are really here. If their not satisfied you will leave they can refuse you entry.
They can also issue you a visitor record, which gives you a limited stay in Canada, immigration officers can then come and check to see if you left.
What you are planning to do is illegal, and will get you deported and banned from Canada.