Delta Air Lines on Sunday night was forced to ground all domestic flights due to what the airline called a “systems outage.”

Even the carrier’s website was down.

The incident happned at approximately 8 p.m. ET

Delta teams are working to fix a systems outage that has resulted in departure delays. Flights in the air remain unaffected.

— Delta (@Delta) January 30, 2017

The Federal Aviation Administration issued an advisory to the public of the problem, and passengers were told to contact Delta for updates.

“Delta teams are expeditiously working to fix a systems outage that has resulted in departure delays for flights on the ground,” the airline said in a statement. “Flights in the air remain unaffected. Delta apologizes to customers for the inconvenience.”

The FAA said on its website that international flights were not affected due to “automation issues.”

This is the second time in a week a computer issue has grounded an airlines. Last weekend, United Airlines briefly grounded all domestic flights.

But this is also the second time in five months that Delta has suffered an embarrassing outage.

READ MORE: Computer Outage Forces Delta To Ground Worldwide Flights

In August, a fire at the company’s power station outside its home base of Atlanta ground flights for days and prompted a personal apology from CEO Ed Bastian. The company took a $100 million loss over the snafu.

Computer and IT problems, however, have been prevalent among U.S. airlines over the last year. United was forced to ground its fleet after a computer glitch three months ago. British Airways suffered a computer problem in September and Southwest was afflicted in July.