WASHINGTON, Oct 25 (Reuters) - Delta Air Lines ( DAL )

on Friday sued CrowdStrike ( CRWD ) in a Georgia state court

after a global outage in July caused mass flight cancellations,

disrupted travel plans of 1.3 million customers and cost the

carrier more than $500 million.

Delta's lawsuit filed in Fulton County Superior Court called

the faulty software update from global cybersecurity firm

CrowdStrike ( CRWD ) "catastrophic."

CrowdStrike ( CRWD ) has previously rejected Delta's criticism and

has suggested it has minimal liability.