Delta Airlines has accused CrowdStrike of “negligence” and claimed they lost at least $500 million as a result of last month’s global network outage. The cyber security firm sent out a software update to customers last month, which led to millions of Windows devices around the world being disabled and the US-based airline having to cancel flights as a result. Delta – who have been hit by a class-action lawsuit from affected passengers – saw their services impacted for several days after the outage, even after other airlines had recovered and cancelled around 7,000 flights over five days. The c…