U.S. airline regulators have opened an investigation into Delta Air Lines, which is still struggling to restore operations on Tuesday, more than four full days after a faulty software update caused technological havoc worldwide and disrupted global air travel. Transportation Secretary Pete Buttigieg announced the Delta investigation on the X social media platform Tuesday “to ensure the airline is following the law and taking care of its passengers during continued widespread disruptions.” MORE: https://www.wtsp.com/article/news/nation-world/delta-flight-cancellations-tech-outage/507-8937d31a-6481-4c2e-a9dc-2b2f155005e6