Delta Air Lines CEO Ed Bastian announced that operations are expected to return to normal on Thursday after CrowdStrike's global outage left the carrier in disarray for almost a week.

The carrier will operate "at a traditional level of reliability," Bastian said in an updated note to customers on Wednesday. 

Delta was the hardest hit of all U.S. carriers following Friday's outage that caused airlines to temporarily halt operations and affected emergency services, banks, hospitals and other businesses. 

"While our initial efforts to stabilize the operations were difficult and frustratingly slow and complex, we have made good progress this week and the worst impacts of the CrowdStrike-caused outage are clearly behind us," Bastian said.

This is a developing story. Please check back for updates.