Once you've booked a mini-rtw, what are the change rules with Aeroplan? At some point I thought I read that you can make changes without fees, but I am now thinking that might just be a fully paid rtw ticket.
It is, at minimum, $90 per passenger. If there are tax changes (I.e. because of routing changes), then you have to pay those, too - but if you reroute through a cheaper airport then you get taxes back from the one(s) no longer in your journey.