Originally Posted by gnaget
Air Canada has always been the quickest route to a gold card, but you probably need to investigate closely by looking at the SQ fares that you buy and the points you earn on various airlines.
AC's Aeroplan doesn't credit any mileage for SQ classes O I R G Q X N or V. Any itinerary/ticket with those classes renders the entire itinerary void for mileage, even if there is only one segment in one of those classes.