Amazon announced Thursday the addition of 15 U.S. cities to its list of eligible Sunday delivery locations. It may not be as big a move as expanding same-day delivery, but it's a significant step in the race to provide instant gratification to online shoppers.

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The cities are clustered in the central part of the country, many within reasonable distance from one of the Internet giant's fleet of distribution centers. They include:

Austin, Texas

Cincinnati, Ohio

College Station, Texas

Columbus, Ohio

Dallas, Texas

Houston, Texas

Indianapolis, Indiana

Lexington, Kentucky

Louisville, Kentucky

New Orleans, Louisiana

Oklahoma City, Oklahoma

Philadelphia, Pennsylvania

San Antonio, Texas

Shreveport, Louisiana

Waco, Texas

Amazon's Mike Roth, VP of North America operations, said most of the items selected for Sunday delivery are part of a weekend errand to-do list:

So far, the most common items delivered on Sunday include baby supplies such as newborn apparel, books and toys. We know ourAmazon customers love the convenience of everyday delivery, and we're excited to be offering Sunday delivery in more cities across the U.S.

Amazon partners with the U.S. Postal Service for its Sunday delivery operations and said since launching Sunday delivery in New York and Los Angeles last November, millions of packages have been bestowed upon shop-happy consumers.

Last month Amazon CEO Jeff Bezos has told investors the company is working on its seventh and eighth generation Prime drones, which the company hopes will be making deliveries by 2015. While the drones would make delivery conisderably faster, the Federal Aviation Administration is still weighing safety concerns.

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