Boeing warned on Thursday that it expected a fourth-quarter loss of about $4 billion to close a year marred by a production quality crisis, stricter regulatory scrutiny, supply chain delays and a crippling strike by U.

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.