它们还指出另一位对手FedEx正为美国邮政服务公司空运快件。

They also point out that FedEx, another competitor, carries express packages by air for the US Postal Service.

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虽然很难辨别哪些包裹里装的是社会保障支票等重要物品，但美国邮政（USPS）和联合包裹服务公司（UPS）会尽其所能优先处理敏感材料。

It can be hard to identify which parcels are carrying crucial items such as Social Security checks, but USPS and UPS try their best to prioritize sensitive material.

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