The Atlanta-based airline didn't say how much it was paying for the new planes, but each one had a list price of $110.1 million, according to the Airbus website. That would value the order at about $1.65 billion, but discounts for buyers of multiple airplanes are common.
Delivery of the 15 planes is expected to begin in 2018.
Delta now has a total of 45 A321s on order from the French aircraft maker. The first one will begin start service in early 2016, and has 169 seats, live satellite TV and in-flight wireless Internet service.
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