As I stated before, it is not valid to simply say "it is more expensive because it is better" after decades of technology advancements.One would have to factor the material used in the construction. Materials are more of a cost factor than simply weight. That being said for commercial aircraft, say the recent increase in MTOW by 6T on the 787-10, it's additional weight gained through structural improvement does generate a price increase. One could argue the customer is simply paying for the additional performance as well.
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