The Federal Aviation Administration (FAA) lifted an hour-long ground stop of all flights across the United States caused by an unspecified technical issue. The brief disruption impacted thousands of passengers during the busy Christmas travel season.

This incident marks the latest in a series of technical challenges faced by the aviation industry. Earlier this year, carriers were affected by a global tech outage linked to Microsoft’s Azure cloud platform and a software issue at cybersecurity firm CrowdStrike.

While flights have resumed, the FAA is working to investigate the cause of the issue and ensure smooth operations moving forward.