Maybe the RJs are smaller? Empress can you confirm?

Maybe the RJ flights were cheaper? Empress is it normally the case that RJ flights are priced slightly lower than A319 flights to reflect the fact the Aeroplan members with status are not able to upgrade and therefore less likely to purchase tickets on those flights; and on what routes/markets would that be more or less the case, can you speculate roughly (nearest dollar, no need to get too detailed) on what the difference in price would be, based on the destination's relative appeal as a business or pleasure destination?

andrew