(In paragraph 6 corrects timing of Crowdstrike ( CRWD ) alert to Friday)

July 19 (Reuters) - A global tech outage was disrupting

operations in multiple industries on Friday, with airlines

halting flights, some broadcasters off-air and everything from

banking to healthcare hit by system problems.

American Airlines ( AAL ), Delta Airlines, United

Airlines and Allegiant Air grounded flights

citing communication problems. The order came shortly after

Microsoft ( MSFT ) said it resolved its cloud services outage

that impacted several low-cost carriers, though it was not

immediately clear whether those were related.

"A third party software outage is impacting computer systems

worldwide, including at United. While we work to restore those

systems, we are holding all aircraft at their departure

airports," United said in a statement. "Flights already airborne

are continuing to their destinations."

Australia's government said outages suffered by media,

banks and telecoms companies there appeared to be linked to an

issue at global cybersecurity firm Crowdstrike ( CRWD ).

According to an alert sent by Crowdstrike ( CRWD ) to its clients and

reviewed by Reuters, the company's "Falcon Sensor" software is

causing Microsoft Windows to crash and display a blue screen,

known informally as the "Blue Screen of Death".

The alert, which was sent at 0530 GMT on Friday, also shared

a manual workaround to rectify the issue.

A Crowdstrike ( CRWD ) spokesperson did not respond to emails or

calls requesting comment.

There was no information to suggest the outage was a cyber

security incident, the office of Australia's National Cyber

Security Coordinator Michelle McGuinness said in a post on X.

The outages rippled far and wide.

The travel industry was among the hardest hit with airports

around the world, including Tokyo, Amsterdam, Berlin and several

Spanish airports reporting problems with their systems and

delays.

International airlines, including Ryanair, Europe's

largest airline by passenger numbers, warned of problems with

their booking systems and other disruptions.

In Britain, booking systems used by doctors were offline,

multiple reports from medical officials on X said, while Sky

News, one of the country's major news broadcasters was off air,

apologising for being unable to transmit live.

Banks and other financial institutions from Australia to

India and South Africa warned clients about disruptions to their

services, while LSEG Group reported an outage of its

data and news platform Workspace.

Amazon's AWS cloud service provider said in a statement that

it was "investigating reports of connectivity issues to Windows

EC2 instances and Workspaces within AWS."

It was not immediately clear whether all reported outages

were linked to Crowdstrike ( CRWD ) problems or there were other issues

at play.