![Click to enlarge airplane](/image/s33/668058/2185.jpg)
© Shawn Thew/EPAReutersThe FAA system includes alerts on items such as runway closures, general bird hazard warnings, or low-altitude construction obstacles.
The US Federal Aviation Administration (FAA)
system that alerts pilots and other flight personnel about hazards or any changes to airport facility services and relevant procedures was not processing updated information, the civil aviation regulator's website showed on Wednesday.
In an advisory, the FAA said its Notam (Notice to Air Missions) system had "failed".
There was no immediate estimate for when it would be back, the website showed, though Notams issued before the outage were still viewable.
More than 400 flights were delayed within, into, or out of the US as of Wednesday 5.31am ET, flight tracking website FlightAware showed.
It was not immediately clear if the outage was a factor.
Comment: Canada also had an outage: This reminds us of similar outages that occurred right before 9-11.