They are not going to put on their best performance just after they laid their eggs, because they haven't invested that much time or energy in parenting yet.

它们不会在刚下蛋后就表现出最佳状态，因为它们还没有在养育孩子上投入那么多时间或精力。

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More details from the February 2013 On-time Performance Report are available on FlightStats.com.

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American tested the idea in seven cities earlier this year and found getting people without overhead bin luggage on early sped up boarding time and improved on-time arrival performance.

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Better on-time performance, for instance, requires spare planes, backup crews, extra mechanics on duty, and so on.

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