The order by Delta is for the current engine option of the aircraft, which Airbus also offers with new, more fuel-efficient engines.
Delta's new acquisition brings its total Airbus on order to 55 aircraft: 45 A321s and 10 A330s. The airline already has a large fleet, including 126 A320s and 32 A330s.
Its first A321 will begin service in early 2016, Delta said in a statement.
"These new airplanes will improve the flying experience for our customers and benefit our shareholders," said Chief Executive Richard Anderson.
Delta is aiming to reinvest around half of its operating cash flow back into the business each year through to 2018, equivalent to around USD 2-3 billion annually.
This year the US carrier is planning to spend USD 2.3 billion, it said in a statement.
The aircraft will be equipped with engines manufactured by CFM, a joint venture between French manufacturer Snecma, subsidiary of Safran Group, and General Electric.
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