Volunteers pay an annual fee, undergo a background screening by the Transportation Security Administration and receive a biometric identification card.

志愿者支付年费，通过运输安全管理署进行背景筛查，并接受生物身份证。

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But the Obama administration said the fee captures only 36 percent of the cost of providing aviation security, and said the increased fee will result in passengers paying "a majority" of the estimated cost of passenger and baggage screening.

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