Sept 23 (Reuters) - Alaska Airlines said on

Monday that it experienced an IT outage that caused significant

disruption to its operations, including delayed flights.

Alaska issued a ground stop in Seattle, it said in a

statement to Reuters, adding that the issue has been resolved

but it expects some residual impact to operations.

The ground stop was for arrivals in Seattle and lasted for

about 2 hours, the airlines said.

On Sunday night, the airline on its X account confirmed

there had been an outage as multiple users complained they were

facing issues accessing its website and app.

"This was not a cyber attack or any kind of unauthorised

activity. It was a certificate issue that impacted multiple

systems," it added.

In April, Alaska Airlines had to

halt

all its flights due to an issue while performing an upgrade

to the system that calculates the weight and balance of its

planes.