American Airlines Group Inc. reported Friday that earnings nearly doubled, as lower operating costs helped offset a decline in revenue.

Shares, down 21% this year through Thursday's close, increased 2.3% in premarket trading.

Passenger revenue per seat mile, a key industry metric, fell 6.9% from a year ago. Passenger yield was down 6.1%. However, cost per available seat mile fell 12.8%. Capacity grew 1.9%, and traffic rose 1.1%.

The product of a late 2013 merger of the old American and US Airways Group Inc., the combined company is proceeding with its integration and plans to tackle the technologically complex switch to a single reservations system late this year. It recently combined frequent-flier plans.

Overall, American earned $1.7 billion, or $2.41 a share, compared with year-earlier profit of $864 million, or $1.17 a share. Excluding certain items, earnings were $2.62 a share.

Revenue fell to $10.83 billion from $11.36 billion a year earlier.

Analysts had expected earnings of $2.60 a share on revenue of $10.86 billion.

The company also authorized an additional $2 billion share-repurchase program, which will be completed by the end of April 2016.

Write to Angela Chen at angela.chen@wsj.com

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