In recent years the budget carrier has softened its no-frills image: in 2014 it introduced business fares, for which passengers enjoy priority boarding and a little more legroom.
请问怎么样理解句中的for？
In recent years the budget carrier has softened its no-frills image: in 2014 it introduced business fares, for which passengers enjoy priority boarding and a little more legroom.
【翻译】近年来，便宜航空公司已改变了其只提供最基本服务的形象：它在2014年推出了商务舱票价，凭此价乘客能享遭到优先登机和更宽敞些的腿部活动舱位。
【剖析】for which passengers enjoy priority boarding and a little more legroom为定语从句，修饰fares（票价），which 指代fares，介词for 提到了关系代词之前。for 的意思是“付出”，表示支付这个价格就能如何。
