Alaska Airlines grounded flights at all U.S. airports on October 23, because of  a technical issue, which also affected Horizon Air, which is operated by the carrier, according to an advisory by the Federal Aviation Administration.

According to BBC News, the U.S. carrier said in a statement that it was "experiencing an IT outage affecting operations" and issued "a temporary ground stop," but did not say how long the outage would last or how many flights were affected. It said it was "actively restoring our operations" following the outage.

Alaska Airlines, part of The Alaska Air Group based in Seattle, Washington, primarily operates on the West Coast of the U.S., but serves 140 destinations globally, including 37 U.S. states and 12 countries, according to its website.

Last year, the carrier merged with Hawaiian Airlines, which was not impacted by the stoppage.

BBC News says this is the second IT outage affecting the airline this year. In July, an outage halted flights for about three hours.