To reinforce its low-cost structure, AirAsia instilled a low-cost culture, emphasizing on cost avoidance. For example, emphasis was placed on the elimination of avoidable expanses such as tag costing (despite reach tag costing less than US$0.05), turning off cabin lights at appropriate times, and not overheating in-flight ovens. Such cost saving measures enabled AirAsia to achieve costs per average seat kilometer of US$0.0213 (the lowest for any airline in the world), with its margins of 38% (before taxes, interests, depreciation, and amortization) being the highest in the world in 2004.