https://www.cnn.com/us/live-news/faa-system-outage-us-flight-disruptions/index.html
"What we know so far:
- The Federal Aviation Administration has lifted a ground stop that it issued Wednesday morning following an outage to a system that provides pilots with notices they need before flying.
- Normal operations are resuming, but delays from the ground stop continue. The latest data from the flight-tracking site FlightAware shows there are more than 4,000 flight delays nationwide.
- You can read more about what to do if your flight has been delayed here."