·2,447,543篇论文数据，部分数据来源于NoteExpress
That is worrying for early A320 customers, such as Air France-KLM, which would normally expect to see a double-digit gain in operating-costs when it replaces a 20-year-old plane.
这使得早期的A320顾客很担忧，比如法国航空，一直希望能看到两位数操作系统代替20年历史的机型。
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