I sent an email to AC-Aeroplan re credits in R 'Comfort' class. They replied:-
Kindly note that under the terms of Spanair’s accumulation structure, flights booked in classes not shown in the corresponding chart are not eligible for mileage accrual unless otherwise specified. For your reference, each airline is responsible for transmitting any updates to Aeroplan and the latter is done at once when the information is received. Accordingly, we are unable to advise members if and when a new class of service may be added to the existing list.
Your patience and cooperation are appreciated.Regards,Aeroplan - Customer Service Representative