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I think the person will need to provide document such as PR card, PRTD, ETA, visa and etc. before boarded. Also, Canuck only mentioned "air". I suppose someone also cross international borders through marine vessels.
OK I get this part. I came back 3 times from Mexico this year and only last time they insisted for a pr card even though I told them I wasn't pr yet. In this case, how the company can refuse only the RTD if they don't have access to Canada immigration system to know if the person is also a pr or not. And arriving in Canada they can't deny her entry with RTD only, anyways.