(Reuters) - Delta Air Lines Inc <DAL.N> said it expects a closely watched performance metric to be near the upper end of its second-quarter forecast, citing improving revenues.
Passenger unit revenue - which compares sales to flight capacity - rose about 2.5 percent in the three months ended June, the No. 2 U.S. airline said on Wednesday.
The airline had forecast passenger unit revenue to increase in the range of 1 percent to 3 percent in the quarter.
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Delta also raised the lower end of its operating margin forecast to 18 percent from 17 percent, while retaining the upper end at 19 percent.
The company's shares rose about 1 percent to $54.45 in early trading.
(Reporting by Ankit Ajmera in Bengaluru; Editing by Sriraj Kalluvila)