Which circumstance will NOT decrease the supply of commercial air travel?

Question

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A technology change that makes aircrafts more fuel efficient will lead to decreased operating costs for airlines, which could lead to an increase in the supply of commercial air travel. An increase in jet fuel prices, an increase in the wages of airline pilots, and a decrease in the number of companies that offer commercial air travel would all lead to increased operating costs for airlines and could lead to a decrease in the supply of commercial air travel.

Which Circumstance Will NOT Decrease the Supply of Commercial Air