 More flight cancellations are expected today as airlines gradually recover from a global tech outage that's left thousands stranded at airports. More than 5,400 flights into, out of, or within the U.S. were canceled Friday and Saturday, and there's more disruption already today. More than 600 flights have been canceled. The issue extends beyond airports with businesses, government agencies, health and emergency services, banks, schools, and even universities worldwide grinding to a halt or seeing services disrupted.