Boeing has reported a net loss of $234 million in its second quarter report and a loss of 37 cents per share, in part due to unforeseen costs concerning the developing KC-46 refueling tanker programs.

“The underlying operating performance of the company remains solid with our commercial and defense teams again delivering strong revenues and operating cash flow. Actions taken during the quarter that impacted our earnings were the right, proactive steps to reduce risk and strengthen our position for the future,” President and Chief Executive Officer Dennis Muilenburg said in a call with reporters on Wednesday. “Our strong cash generation also supported our ongoing commitment to invest in product innovation and in our people, and return substantial cash to shareholders through stock repurchases and dividends.”