 Airlines have been among the worst impacted here in the U.S. American, Delta, United all had to ground their flights overnight. American and United say they have begun restarting their operation, but we're seeing very long lines at airports. This outage basically impacted the airline's back-end systems, so they weren't able to communicate the information they needed to dispatch flights. That's slowly starting to change, but unclear how long it will take to get back up to full speed. Expect delays throughout the day.