updated 1/25/2010 3:47:14 PM ET 2010-01-25T20:47:14

Delta Air Lines Inc. will invest US$1 billion over the next three-and-a-half years to improve customer service, remodel existing aircraft and improve fuel efficiency instead of buying new planes like some of its competitors.

Delta, the world's biggest airline, said Monday it will spend roughly US$300 million per year through mid-2013 to add more entertainment options in coach cabins, lie-flat seats for international premium customers, airport VIP lounges and other customer service enhancements.

Some of the money will also go to improving fuel efficiency.

Delta, based in Atlanta, said that rather than invest in new aircraft, it wants to spend money to improve the consistency of services offered to different groups of customers.

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