WASHINGTON, Feb 1 (Reuters) - A key U.S. pilot messaging

system was experiencing a temporary outage, which could lead to

flight delays on Sunday, U.S. Transportation Secretary Sean

Duffy said late on Saturday.

The Federal Aviation Administration is working to restore

the "Notice to Air Mission" or NOTAM system, Duffy said on X.

"There is currently no impact to the National Airspace

System because a backup system is in place," Duffy said. "FAA

has set up a hotline to communicate with aviation stakeholders

and will send notices every 30 minutes with updates on the

system's status."

In January 2023, an outage of the NOTAM system led to the

first nationwide U.S. groundstop since 2001, disrupting more

than 11,000 flights.