1. The more seats an airline can put in an airplane, the more money it will make. However, if seats are too narrow, passengers will be angry and uncomfortable. An airline might first consider the average woman's hip breadth when designing seats. Why would the airline use women instead of men when determining the maximum width of an airline seat?
Airlines would use women instead of men because women usually have wider hips compared to the average men. So if they give enough room for the average women, then there will be enough room for the average man.