Boeing’s second-quarter loss narrowed and revenue improved as the aircraft manufacturer delivered more commercial planes in the period. Boeing Co. lost $611 million, or 92 cents per share, for the three months ended June 30. A year earlier it lost $1.44 billion, or $2.33 per share. Adjusting for one-time gains, Boeing lost $1.24 per share. This was better than the loss of $1.54 per share that analysts surveyed by Zacks Investment Research expected. Shares rose slightly before the market open on Tuesday. Revenue climbed to $22.75 billion from $16.87 billion, mostly due to 150 commercial deliveries compared with 92 deliveries in the prior-year period. The performance topped Wall Street’s estimate of $21.86 billion. “Our fundamental changes to strengthen safety and quality are producing impro

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