Mass IT outage: here's a list of all the companies and operations affected

• A huge global IT outage is disrupting flights, banks, retailers, and media outlets.
• The widespread disruptions have been linked to an issue with cybersecurity firm CrowdStrike.
• Operations affected include airlines in the US and Europe, supermarkets, and some 911 lines.

A mass IT outage has hit flights, banks, retailers and media outlets around the world.

The issues appear to be linked to cybersecurity firm Crowdstrike.

Microsoft also acknowledged the issue in an X update early Friday: writing, "Our services are still seeing continuous improvements while we continue to take mitigation actions."

Here are some of the companies and operations affected.

United Airlines, Delta Air Lines, American Airlines, Allegiant Air

Airlines including United, Delta, American, and Allegiant have all grounded flights due to the mass outage.

American Airlines has blamed the issues on Crowdstrike. The airline said the tech problems are because of a "technical issue with Crowdstrike that is impacting multiple carriers," per BBC News.

On Thursday night, Frontier Airlines issued a similar ground stop order, saying in a statement: "Flight operations are currently being impacted by a major Microsoft technical outage."

London Stock Exchange

The London Stock Exchange's website is also experiencing issues.

"RNS news service is currently experiencing a third-party global technical issue, preventing news from being published on www.londonstockexchange.com," the company said in a statement.

"Technical teams are working to restore the service. Other services across the group, including London Stock Exchange, continue to operate as normal," it continued.

Sky News

Sky News also appears to have been hit by the outage. The UK news channel has been showing archive footage and briefly displaying an error message.

The news site appears to be up and running at the time of writing.

McDonald's Japan

According to a Bloomberg report, McDonald's Japan suspended about a third of its stores in the country on Friday. The issue is with the stores' cash registers, the report says.

911 lines

According to a Facebook post from Alaska State Troopers, emergency lines in the state are also affected.

The post said: "Due to a nationwide technology-related outage, many 911 and non-emergency call centers are not working correctly across the State of Alaska."

"We appreciate your patience and will update you when we know more," the statement said.