Some frequent fliers rely on melatonin to put them to sleep in the air.

一些经常乘坐飞机的人总是依赖褪黑激素在飞机上睡觉。

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But birds are far less likely to suffer from the clot formation called economy class syndrome-despite being frequent fliers.

但尽管小鸟是空中常客，它们不太可能患上我们容易患上的经济舱综合征。

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The unfair fact is that his kind of appeal can be a fast track to character, like one of those express lines frequent fliers enjoy.

他这种外貌上的优势会让他扮演的角色更易成功，就像飞行常客可以享受机场快速通道一样，有些不太公平。

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Frequent fliers may grumble about increased ticket prices, extra baggage fees, schedule changes and discontinued routes.

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American offers Group 2 boarding, right after elite-level frequent fliers, to passengers without overhead-bin luggage.

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First, many seats on flights are reserved for elite-level frequent fliers or full-fare business travelers.

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