The incident prompted the US Transportation Department to open an investigation. "If CrowdStrike had tested the faulty update on even one computer before deployment, the computer would have crashed," Delta's lawsuit said. "Because the faulty update could not be removed remotely, CrowdStrike crippled Delta's business and created immense delays for Delta customers." Delta said that as part of its IT-planning and infrastructure, it had invested billions of dollars "in licensing and building some of the best technology solutions in the airline industry." CrowdStrike has questioned why Delta fared so much worse than other airlines and said it has minimal liability, something Delta rejected. Last month, a senior executive at CrowdStrike apologised before Congress for the faulty software update. Adam Meyers, a senior vice-president at CrowdStrike, said the company released a content configuration update for its Falcon Sensor security software that resulted in system crashes worldwide.