More than 900 US flights are cancelled on Sunday after a major ground stop on Friday, according to flight-tracking data cited by Vanguard. The cancellations follow a heavy impact over the previous days, with FlightAware reporting thousands of cancellations on Saturday and a larger total on Friday.

The US Federal Aviation Administration says the wider air disruption—linked to a communications failure—will result in more than 16,000 cancellations by Saturday. In remarks reported by the Jamaica Observer, FAA chief Bryan Bedford said 12,000 flights were cancelled on Friday, and that an additional 4,000 to 5,000 of roughly 41,000 scheduled flights on Saturday were expected to cancel.

A separate report from Free Malaysia Today also points to continuing disruptions, saying that more than 20,000 flights were affected by Friday’s nationwide stoppage and listing counts of cancellations and delays reported on Saturday. Together, the outlets describe an ongoing travel disruption, with differences mainly in reported totals and the time window used for counting cancellations and delays.