Originally Posted by Pseudo Nim

First of all, try another agent. Aeroplan is not as wildly inconsistent as US Dividend Miles, but there is some variation with agents. As I earlier posted, I had one agent try to "blackmail" me into routing on AC + LH on the outbound to be "allowed" a return that was bordering on MPM5. You need to try again, and supervisors don't always help 'cause they are often just as clueless.

You need to ask them to check the maximum permitted mileage (they do not understand MPM, or MPM5), and maybe (now, this is conjecture on my part based on previous calls I had) they need not to calculate it using a specific airline, but *just* MPM (because I believe they can display MPM as published by an airline, which, I suspect, uses a published routing - OR they can just show it as a "global" one of sorts, which should return the 21,000 mile figure you are looking for).