Alaska Airlines halted all departures at airports nationwide on Thursday due to a technical issue.
The US carrier announced that it was "experiencing an system disruption impacting flight schedules" and implemented "a temporary ground stop."
The airline did not say how long the outage would last or the number of flights were affected. It stated it was "working to resume our operations" following the incident.
The operational halt also affected Horizon Air, which is a subsidiary of Alaska Airlines, as per an notice by the Federal Aviation Administration.
Alaska Airlines, part of The airline group headquartered in Seattle, Washington, mainly serves on the West Coast of the US. It services 140 destinations globally, including 37 states and dozens of nations, according to its online platform.
Last year, the airline merged with Hawaiian Airlines, which was unaffected by Thursday's ground stop.
It is the second IT outage affecting the carrier this year. Earlier this year, an outage disrupted operations for about several hours.
Alaska Airlines did not immediately respond on the day to requests for comment.
US air travel has been complicated in recent weeks due to federal budget issues that began recently. Shortage of air traffic controllers reporting for duty has caused delays at multiple locations.
