UPDATED: 5:14 PM ON 8-8-16
Delta says its systems are now fully operational, but delays and cancellations will continue as the company recovers from the power outage.
Delta says some critical systems and equipment failed to switch over to backup systems after the outage, and it is investigating why that happened.
Affected customers will get vouchers for new flights.
UPDATED: 9:37 am on 8-8-16