A strike beginning Friday by more than 30,000 of Boeing’s West Coast factory workers will make it harder for the planemaker to meet a 737 MAX production target and stabilize its supply chain, CFO Brian West said Friday.West also told the Morgan Stanley Laguna Conference he expects third-quarter margins from the company’s defense and space unit to be negative, similar to those in the second quarter.Boeing shares slid 4% on Friday. 3 Boeing factory workers gather on a picket line during the first day of a s ...