Its shares climbed 9% as of 4:16 p.m. after regular trading in New York.

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United joined Delta Air Lines Inc. with a robust fourth-quarter outlook as US carriers try to steady themselves following an uneven summer travel season and capitalize on strong demand. Large companies have resumed lucrative international trips after requiring workers to return to offices, joining leisure travel that already had rebounded. That’s helping keep fares elevated even after summer.

The Chicago-based carrier also said Tuesday that adjusted earnings in the third quarter were $2.81 a share, topping the $2.29 average analyst estimate. Revenue was $12.88 billion, compared with an expected $12.72 billion. Costs to fly each seat a mile rose 14.5%, excluding fuel, below United’s own forecast for a 16% jump.

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