Hundreds of Alaska Airlines flights and thousands of passengers’ travel plans were disrupted over the weekend and well into Monday following a “significant IT outage” that resulted in the grounding of planes for about three hours.

Alaska Airlines has revealed that its "significant" IT outage on Sunday night was not caused by hackers, but by hardware at one of its data centers failing.

The outage was a result of an unexpected hardware failure in Alaska's data centers and is not related to cybersecurity issues, the airline said.

Alaska Airlines warned of more flight disruptions on Monday after an unexpected failure of a critical piece of hardware at its data centers late Sunday forced it to halt all flights for about three hours.

Alaska Airlines said its operations have resumed after a temporary ground stop was issued on all its flights and those of a regional subsidiary Horizon Air due to an IT outage affecting its operations,

The failure, in the airline’s computer network, forced it to ground flights Sunday night for about three hours. The outage, tied to third-party equipment, yielded about 200 cancelled flights. A replacement is underway.

In spite of this challenge, though, CrowdStrike still has managed to grow -- with revenue climbing in the double digits -- and it's maintained strong relationships with customers. This has helped the stock advance more than 50% from the outage on July 19 of last year. Is CrowdStrike today, a year after the big IT outage, a buy? Let's find out.

The airlines said it experienced an IT outage that was affecting its operations. It resumed flights a few hours later.

U.S. carrier Alaska Airlines grounded its flights after an IT outage on Sunday that affected its systems, the company said, without specifying the nature

Alaska experienced an IT outage around 8 p.m. Travelers were advised to expect "residual impacts" after the ground stop ended at 11 p.m.

A Mercy Health spokesperson told News Center 7 that the Chiller HVAC system experienced an outage at Springfield Regional Medical Center. It was restored within two hours. Some concerned patients called our newsroom. Melissa Stevens and her husband, Ryan, said the timing was unfortunate, but that such things do happen.