Alaska Airlines grounded all of its flights nationwide on Sunday night following a major IT outage that disrupted its operations across the United States. The carrier, along with its regional partner Horizon Air, enacted a temporary system-wide ground stop, halting both domestic and international services.

The incident began around 8:00 PM Pacific Time and extended into the late evening, with operations resuming only after several hours of interruption. Passengers were left scrambling for updates, as the airline urged travelers to check their flight status before heading to the airport.

What Triggered the Ground Stop?

According to Alaska Airlines, the disruption was caused by a system-wide IT failure that affected core operational systems. The airline reported the outage at approximately 8:00 PM PT on July 20, 2025. As a result, it requested a full ground stop from the Federal Aviation Administration (FAA) for both Alaska and Horizon Air flights.

The FAA confirmed the halt on its live flight status dashboard, noting that all destinations were affected. This type of ground stop is rare for a single airline and underscores the severity of the IT issue. Operations slowly resumed around 11:00 PM PT, but the ripple effect was expected to continue well into Monday.

In a statement, the airline said, “We requested a temporary, system-wide ground stop for Alaska and Horizon Air flights until the issue is resolved.” Passengers on Sunday evening were advised to check their flight status via the Alaska Airlines app or website before proceeding to airports.

Flight Disruptions and Passenger Impact

While the exact number of grounded flights has not yet been disclosed, flight tracking data showed dozens of Alaska Airlines departures either canceled or severely delayed across major hubs including Seattle, Portland, and Los Angeles.

The airline warned of “residual” delays and disruptions throughout the night and into the next day, meaning that even after the ground stop was lifted, normal operations would take time to restore. This included repositioning aircraft, reassigning flight crews, and accommodating displaced passengers.

Alaska Airlines’ customer service lines and social media accounts were inundated with requests for updates. Many passengers took to X (formerly Twitter) to express frustration over the lack of transparency and support, particularly at late hours when rebooking options were limited.

On its website, Alaska posted a red-banner notice: “We are currently experiencing IT system issues that may affect your travel. Please check your flight status.”

Rising Concerns Over Cybersecurity in Aviation

While Alaska Airlines has not confirmed whether the outage was the result of a cyberattack, the timing and scale of the incident have raised broader concerns about vulnerabilities in the airline industry’s digital infrastructure.

Recent years have seen multiple high-profile IT and cybersecurity breaches involving airlines. Microsoft and Palo Alto Networks have both issued warnings about ongoing threats targeting transportation sectors. Notably, hacker groups like “Scattered Spider” have been linked to disruptions in critical infrastructure sectors, including aviation.

The aviation sector’s increasing reliance on centralized digital systems has created a new frontier of risk—one where IT failures can ground entire fleets in minutes.

In January 2023, a similar systems failure involving the FAA’s NOTAM (Notice to Air Missions) system halted all U.S. departures nationwide. Though that incident stemmed from a database error, it underscored just how dependent airlines and regulators are on stable, secure digital operations.

Regulatory and Expert Response

The FAA confirmed Alaska Airlines’ ground stop on its live status page but has not yet launched a formal investigation. That may change if the incident is determined to have safety or systemic implications.

Alaska Airlines issued an apology, stating: “We’re deeply sorry for the disruption and are working quickly to resolve the issue and accommodate our guests.”

Experts in transportation security say the industry needs to mandate redundant systems and improve recovery protocols for digital failures. “Airlines should be required to maintain offline backups and recovery plans for precisely these scenarios,” said one senior cybersecurity analyst following the story.

As air travel demand continues to grow post-pandemic, ensuring IT reliability is now a matter of operational security—not just convenience.

What Travelers Should Know

Alaska Airlines has not released full details about the cause of the outage but confirmed that a full IT audit is underway. Passengers affected by cancellations are encouraged to rebook their flights through the airline’s website or mobile app, where they may also request refunds or travel credits.

Travel experts recommend that affected passengers keep records of their expenses, document flight changes, and request written confirmation of delays for insurance purposes.

With incidents like this becoming more frequent, travelers are advised to monitor airline alerts closely, download mobile apps, and arrive at airports with extra lead time when possible.

In the coming days, the FAA may issue further updates, particularly if a cybersecurity component is discovered. Until then, Alaska Airlines will be working to regain public trust and restore operational normalcy after one of its most disruptive nights in recent memory.