平均机龄

 

刚看到国航引进波音747-8,提到平均机龄6.22年,于是查了下,中国三大航都在6年左右,而美国Allgiant Air 达到23年

http://www.ibtimes.com/worlds-15-oldest-airline-fleets-how-do-us-based-airlines-rank-1475194

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