Southwest Airlines operations were snarled Friday morning after what the carrier described as a "brief interruption" due to a system outage at its vendor, Amadeus, which supplies its reservation and passenger-service technology. NBC 5 Dallas-Fort Worth, citing The Dallas Morning News, reports the trouble disrupted boarding pass printing and mobile app scanning. Southwest said it continued to check baggage and board flights manually while full functionality was restored, and apologized to customers for the inconvenience.

According to flight tracking site FlightAware, as cited by NBC 5 Dallas-Fort Worth, Southwest had delayed nearly 900 flights and canceled 43 nationwide by 9:15 a.m. Simple Flying reports that by 5:00 p.m. ET, FlightAware data showed more than 1,500 delayed flights, roughly a third of all Southwest flights up to that point, as ripple effects persisted through the day.

The Denver Gazette reports passengers on social media said gate employees began informing them around 6:45 a.m. that the airline was experiencing an outage, and one passenger in Denver posted on X that gate staff announced all Southwest planes nationwide that were not in the air were being held. Audacy's KRLD reports the technical issues began shortly after 7:00 a.m. local time, grounding flights, freezing digital services, and forcing gate agents to process passengers manually during the peak morning travel window.

Simple Flying notes the outage struck despite Southwest's heavy investment in modernizing its infrastructure after the disastrous December 2022 meltdown, when Winter Storm Elliott led to nearly 17,000 cancellations and stranded more than two million passengers. The carrier has invested more than $1 billion in operational improvements, per the outlet, including an expanded AWS cloud partnership announced in June. Yet a vendor-side failure still forced manual passenger processing across the network.

Simple Flying lays out a long history of Southwest technology failures: a July 2016 network router malfunction that led to roughly 2,300 cancellations over four days, June 2021 weather-data and connectivity failures causing about 500 cancellations, and an April 2023 vendor-supplied firewall failure that prompted a nationwide departure ground stop with over 2,100 delays. Hoodline adds that Southwest's on-time performance slid from 79.75% in January to 64.94% in June, per OAG data, and notes Amadeus outages have also disrupted airports including Heathrow, CDG and Singapore.

Southwest confirmed systems were back online at 10:15 a.m. ET, roughly two hours after issues were first noticed, per Simple Flying, and said it was working to get customers to their destinations as quickly as possible. Amadeus attributed the incident to an unidentified third-party technology provider and apologized to passengers, according to Simple Flying. The outlet suggests the episode underscores that redundancy and contingency planning matter as much as modernization, since the airline's planned AWS transition cannot eliminate failures at external providers.