Hello, I looked at the Aeroplan upgrade chart (http://www2.aeroplan.com/saua/Chart.do) and it refers to booking classes "Y/B" and "C/D". How do I search for fares that are from these classes? When I use the AirCanada interface it only shows Tango Plus, Exec First Lowest and Exec First Flexible fares. There are no Latitude fares available. At the last page before checkout, I can see that it is using an "S" fare or "W" fare. Does this mean I have to call in to find out what the Y/B and C/D fares are for my route? Can I use Aeroplan points to upgrade another Star Alliance member itinerary (e.g. United)? Thanks in advance!