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A group of passengers have filed a class action lawsuit against Delta Air Lines, claiming the airline refused to issue refunds after a worldwide tech outage led to the cancellation of thousands of flights.

Let’s bring you up to speed: The initial outage on July 19th, caused by a software update from CrowdStrike, a cybersecurity firm, affected multiple airlines globally, with Delta Airlines experiencing the most significant impact. The update crashed Windows software computers, leading to thousands of flight cancellations and delays. Although CrowdStrike quickly rolled out a fix, Delta’s recovery was slow. CrowdStrike argued that the prolonged disruption was due to Delta’s IT decisions and response, noting that other airlines were able to recover rapidly.

What customers are claiming: According to court documents, lawyers for some customers claim that Delta “refused” to refund customers for flights impacted by the global tech outage. They added, “These unfair, unlawful, and unconscionable practices resulted in Delta unjustly enriching itself at the expense of its customers.”

Delta threatening to sue CrowdStrike: Despite CrowdStrike’s claims that Delta’s prolonged issues were due to themselves, Lawyers for Delta have threatened to sue CrowdStrike, claiming the company cost them $500 million in losses. During an interview on CNBC, CEO Ed Bastian said the company had “no choice” and would move forward with a lawsuit.

FAA Investigating: Alongside the lawsuit, the US Department of Transportation has opened an investigation into Delta Airlines. In a brief statement announcing the investigation, Transportation Secretary Pete Buttigieg emphasized that “all airline passengers have the right to be treated fairly, and I will make sure that right is upheld.”