Software Upgrade May Have Caused Cancellations

The US Federal Aviation Administration said that a software upgrade at an ATC facility in Leesburg, Virginia, may have led to more than 440 flights being cancelled on Saturday.

Travel at airports affected by the problem resumed normal operations by Saturday evening after tens of thousands of passengers were affected by flights up and down the Atlantic Coast being cancelled or delayed.

In a post on Facebook, the FAA said it had disabled the new features added from the upgrade until it completes its investigation.

There is no sign that the automated software that was upgraded has any "inherent problems," the FAA said.