| The 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。 |
| The 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. | |
| gen ju hang guan wei, mei guo qi da hang kong gong si ji zu de ping jun shi yong nian xian shi 14 nian. ta hai fa xian mei guo he de er ta xi bei yong you zui lao de ji zu, ping jun shi yong 16 nian. |
| The 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. | |
| gēn jù háng guǎn wěi, měi guó qī dà háng kōng gōng sī jī zǔ de píng jūn shǐ yòng nián xiàn shì 14 nián. tā hái fā xiàn měi guó hé dé ěr tǎ xī běi yōng yǒu zuì lǎo de jī zǔ, píng jūn shǐ yòng 16 nián. |
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