【英语专四听力周计划】短文理解9
Hints:U.S.Airline Monitor
Delta/Northwest
http://t1.g.hjfile.cn/listen/201301/201301300110457469852.mp3The average age of the fleet of the seven large U.S. passenger airlines is about 14 years old, according to The Airline Monitor. It found American and Delta/Northwest had the oldest fleets, at about 16 years on average.根据航管委，美国七大航空公司机组的平均使用年限是14年。它还发现美国和德尔塔/西北拥有最老的机组，平均使用16年。
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