Boeing suffered further losses on several fixed-price defense contracts, with the largest charge for the company stemming from deliveries of the MQ-25 Stingray air refueling drone, the company announced in its second-quarter earnings call today. The Stingray logged $147 million in charges due to “higher costs to meet certain technical requirements,” Boeing reported in its Q2 earnings summary , which showed a decrease in defense revenues to $6.2 billion from $6.9 billion and a unit operating margin that fell to...