Russia flag carrier Aeroflot was forced to cancel numerous flights after a pro-Ukrainian group of hackers said it was behind a cyberattack.
The Silent Crow group claimed responsibility.
Dozens of Aeroflot flights were cancelled on Monday.
There was some disruption to virtually all its IT systems causing major flight schedule changes.
“Customers may encounter issues when accessing our services,” the airline said.
“We kindly ask passengers to monitor real-time updates on airport websites, information displays, and public announcements across the route network.”
Aeroflot hasn’t said when all services will be back up and running.
The airline’s IT teams were ‘actively working to minimise the impact on flight operations and restore all services to as quickly as possible.’
By late Monday, more than 40 domestic flights were cancelled, according to online flight trackers.
Both the Kremlin and the Russian Prosecutor General confirmed the cyberattack and a criminal investigation is ongoing.
Silent Crow said its motivation for the attack was Russia’s invasion of Ukraine.
