军用老龄飞机的延寿及改进改型要花费几百万美元。但这是否意味着这些飞机就能像预期的那样继续使用呢?经济效益仍是决定这些老龄飞机是被淘汰还是继续改进的关键。例如B-52飞机上机翼表面的设计寿命为40000飞行小时,很难确定的是到2040年买一架它的后继飞机的费用是多少,若购买这种新飞机的费用是几十亿美元,那么花一百万美元更换一 Life extension of military aging aircraft and improved retrofitting cost millions of dollars. But does that mean that these aircraft will continue to function as expected? Economic benefits are still the key to determining whether these older aircraft will be eliminated or will continue to improve. For example, the design life of a wing surface on a B-52 aircraft is 40,000 flight hours. What is difficult to determine is how much it will cost to acquire one of its successor aircraft by 2040, and the cost of purchasing such a new aircraft will be several billion dollars , Then spend a million dollars to replace one