Boeing lost roughly $4 billion in the most recent quarter, when the jet maker was hit by a debilitating strike, suffered mounting losses in troubled U.S. government projects and incurred costs tied to sweeping job cuts rolled out at the end of the year. Thursday’s warning came before Boeing was scheduled to release its full results on Tuesday. The $4 billion expected loss includes big write-downs on money-losing projects for the Pentagon and in the company’s commercial jet business.