IATA regularly posts updates on how airlines are faring when it comes to the split between premium and economy passengers. Traditionally, premium traffic has made up around 10% of the passenger mix but the eocnomic downturn has seen a slump at the front of the plane, as can be sween in the chart below (click on it to see it at full size):

However, the change in premium traffic varies considerably depending on route, as the following chart (for the month of November 2011) shows:

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