A disruption to a system housing United Airlines’ flight information that caused more than 1,000 delays has been resolved.

An undisclosed “technology issue” delayed more than 1,000 United Airlines flights across the U.S. United Airlines said in a statement Wednesday that flights on major routes were held at their departure airports because of a technology issue.

A “technology issue” that prompted United Airlines to ground flights across the US on Wednesday, triggering more than 1,000 delays and dozens of cancellations, has been resolved, the airline told CNN.