Delta Airlines CEO Ed Bastian offered his employees two free tickets on Friday to thank employees who were affected by massive disruptions last month attributable to a botched CrowdStrike Software update that left 1000’s of consumers and crew stranded.

Delta struggled greater than its competitors to get better from the outages that took 1000’s of Windows machines offline worldwide and affected industries from healthcare to banking.

According to FlightAware, the airline canceled greater than 5,000 flights between July 19 and July 24, greater than in all of 2019. Bastian said earlier this week the incident cost the corporate about $500 million, a sum similar to about 40% of Delta's second-quarter profit. A crew-tracking platform contributed to the cancellations and disruptions, the airline said.

Delta told CNBC's “Squawk Box” on Wednesday that the airline needed to manually reset 40,000 servers.

The outage “was a humbling moment for our company,” Bastian said in his note on Friday, which was seen by CNBC. “I know this has been extremely difficult and I am deeply sorry for what you have had to go through. A disruption of this length and magnitude is simply unacceptable – you and our customers deserve better.”

More than 4,000 Delta flight attendants took over greater than 6,100 flights in the course of the disruptions and received additional compensation for doing so, in accordance with one other Delta worker memo on Friday.

“Your efforts throughout have been nothing short of heroic,” Bastian told staff.

The two “Positive Space” passes Bastian offered employees are confirmed seats, like a customer would have, relatively than the free standby flight that airline employees often take when seats can be found.

The Delta Organizing Committee of the Association of Flight Attendants (CWA), which is within the midst of a campaign to unionize Delta's flight attendants, said offering passes “simply won't be enough.” The Organizing Committee said in a written statement that the airline's management routinely makes “meager adjustments to maintain operations without making changes large enough to prevent a future collapse.”

Delta's operations have since stabilized, however the flight cancellations and delays have left 1000’s of individuals stranded and damaged Delta's high reliability. Executives often indicate that Delta is successfully attempting to attract each personal and business customers who’re willing to pay more to fly with the airline, and is marketing itself as a premium airline.

A Delta spokesperson said earlier this week that the airline had processed “thousands” of refund and reimbursement requests.

The U.S. Department of Transportation is investigating the disruptions at Delta, Transportation Secretary Pete Buttigieg said last week. Similar disruptions at other airlines, comparable to the huge 2022 holiday collapse at Southwest Airlines after winter storms have shown how technical problems can significantly disrupt air traffic.

Bastian said Delta plans to take legal motion against CrowdStrike and Microsoft “to compensate for our losses caused by the default” and that the corporate has commissioned the law firm Boies Schiller Flexner.

Microsoft declined to comment. CrowdStrike said it was “not aware of any lawsuit and would not comment further.”

Delta Airlines CEO Ed Bastian said Wednesday that the large IT outage earlier this month that stranded hundreds of consumers will cost the corporate $500 million.

Bastian said the figure includes not only lost revenue but in addition “tens of millions of dollars per day in compensation and hotel costs” over a five-day period. The amount is roughly consistent with analysts' estimates. Delta didn’t disclose what number of refunds and reimbursement requests it has processed, but a spokesperson said it was within the “thousands.”

The airline has canceled greater than 5,000 flights, greater than in all of 2019, following the outage through July 25, which was triggered by a botched CrowdStrike software update and took hundreds of Microsoft systems offline around the globe. The company needed to manually reset 40,000 servers, Bastian said.

Following the outage, Delta's platforms that assign flight crews to aircraft could now not sustain with the changes, causing further disruptions.

The problem was much like the Southwest Airlines Customers suffered through the 2022 year-end holiday season, demonstrating how an issue with just one in every of the numerous technology platforms airlines depend on may cause disruption on a big scale.

Other airlines recovered more quickly, and Delta's cascading disruptions and customer response sparked an investigation by the U.S. Department of Transportation. The collapse was unusual for the airline, which markets itself as a premium carrier with top profitability and on-time performance rankings amongst U.S. carriers.

Bastian told CNBC's “Squawk Box” on Wednesday from Paris, where he traveled last week, that the airline would seek compensation for the disruptions, adding: “We have no other choice.”

“If you want to have access, priority access to the Delta ecosystem in terms of technology, you have to test things. You can't go into a mission-critical 24/7 operation and tell us we have a bug,” Bastian said.

CrowdStrike has not yet made any offers to assist Delta financially, Bastian added, beyond offering free advice on find out how to take care of the aftermath of the outage. A spokesperson for CrowdStrike said in an emailed statement that it was “not aware of any lawsuit and could not comment further.” Microsoft didn’t immediately reply to a request for comment.

Delta has hired outstanding attorney David Boies to hunt damages from each CrowdStrike and Microsoft, CNBC reported earlier this week. Boies is thought for representing the U.S. government in its landmark antitrust case against Microsoft.

“We have to protect our shareholders. We have to protect our customers and our employees from the damage. Not only from the costs, but also from the brand damage and the reputational damage,” said Bastian.