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SEATTLE -- The U.S. Postal Service and Amazon are joining forces to get packages to their destinations faster with the possibility of Sunday delivery in some markets, specifically Los Angeles and New York City.

Members of Amazon Prime, who already receive free two-day shipping, will be able to get their Amazon purchases on Sunday starting this year.  In 2014, the company plans to expand the service to Dallas, Houston and New Orleans, among others.

If a purchase is eligible, the Sunday-delivery promise will show up at checkout when it's available in the shopper's region.