The airline halted all departures at airports nationwide on Thursday due to a system failure.
The airline announced that it was "experiencing an system disruption affecting flight schedules" and implemented "a temporary ground stop."
The carrier did not say how long the disruption would continue or how many flights were impacted. It stated it was "actively restoring our operations" after the incident.
The operational halt also affected Horizon Air, which is a subsidiary of Alaska Airlines, as per an notice by the aviation authority.
Alaska Airlines, part of The Alaska Air Group based in Seattle, Washington, mainly serves on the western seaboard of the United States. It connects 140 destinations globally, including 37 states and dozens of nations, according to its online platform.
Last year, the carrier joined forces with Hawaiian Airlines, which was unaffected by the day's ground stop.
It is the latest IT outage impacting the carrier this year. Earlier this year, an outage halted flights for about several hours.
Alaska Airlines did not provide a comment on the day to requests for comment.
US air travel has been disrupted in recent weeks due to the US government shutdown that began recently. Shortage of flight controllers showing up for work has delayed flights at several airports.
