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(Reuters) - Boeing Co reported a 52 percent increase in quarterly profit, helped by a rise in commercial aircraft deliveries and raised its full-year earnings forecast. The company said commercial aircraft deliveries rose 7 percent to 181, including 30 Dreamliner jets, in the second quarter ended June 30. Boeing's ability to churn out the Dreamliner, which was hit by problems with its lithium-ion batteries last year, is crucial to the company's financial performance this year as it is relying on commercial jets to offset a weak defense business. The planemaker delivered its first stretched Dreamliner 787-9 in the quarter.