 NBC News Radio. I'm Scott Carr. More flight cancellations are expected 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, as more than 600 flights are already canceled this morning. Investigators believe the shooter in former President Trump's assassination attempt may have flown a drone over the rally site for surveillance.