Delta Air Lines' chief operating officer is leaving at the end of the month, the company said in a securities filing on Friday.CEO Ed Bastian said in an employee memo that Chief Operations Officer Mike Spanos is taking a job at another company.His departure, after just over a year on the job, comes weeks after Delta suffered a meltdown in the wake of the massive CrowdStrike outage in July. Delta estimates those disruptions cost the airline some $500 million and said it will seek compensation from CrowdStrik ...