I have a friend who has an already ticketed reward ticket YYZ - YVR in Business Class (D-class). He wants to change the date of travel, and of course all flights on his preferred date are full in D-class. Has anybody ever had any luck calling AC Aeroplan and begging them to call Rev management and have them release a J seat and convert it to D? I have managed to do that before, but only on same day stand-by at the airport, but how about if you call ahead? Is it worth a shot?