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美国现役的空中加油机主力是KC-135,它是在原波音707原型机的基础上发展而来的一种专用飞机,共生产了732架,目前还有500多架在使用。这些飞机平均服役期已超过
The mainstay of the current US tanker tanker is the KC-135, a dedicated aircraft developed on the basis of the original Boeing 707 prototype, producing a total of 732 aircraft and currently there are more than 500 aircraft in use. The average length of service of these aircraft has exceeded