Hundreds of U.S. flights are canceled for the 4th straight day. Here’s the latest on the global tech outage

(CNN) – Hundreds of U.S. flights were canceled Monday as carriers, particularly Delta Air Lines, work to recover four days after a global tech outage caused massive delays and left travelers stranded at airports around the nation. Delta is facing mounting pressure to get passengers back in the air, as it continues to rack up the majority of canceled U.S. flights. U.S. Transportation Secretary Pete Buttigieg has expressed frustration with the pace of Delta’s recovery and its CEO has apologized to affected travelers. Related Stories Over 1,000 flights into, within or out of the United States were canceled by Monday afternoon, and over 8,000 were delayed, according to flight tracking site FlightAware. Delta passengers have been slammed by more than 4,400 cancellations since Friday, including more than 850 on Monday, by far the most of any airline. Delta declined to comment on the numbers, but in an update to customers Sunday afternoon, CEO Ed Bastian said the company is working to restore operations for its customers. On Monday, Bastian told employees by video message: “We’ve got everyone around this company working around the clock to get this operation where it needs to be,” according to a news release. The airline...