The margin of error was plus or minus three percentage points.
误差幅度大约为三个

。
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Over the years, these extras have added up. JetBlue and Spirit, for example, have increased their overall revenues by several percentage points through these fees alone; and this has forced customers to decide with their dollar what they want.
多年来,这些额外
费用越来越多。例如,捷蓝航空和精灵航空仅通过这些收费就将总收入提高了几个百
点;这就迫使顾客用自己
钱来决定他们想要什么。