Delta Air Lines reportedly canceled 300 flights Tuesday morning, a day after a mammoth outage that forced it to temporarily ground thousands of flights worldwide and ultimately cancel more than 400 of them. Although an update posted at 10:00 p.m. ET Monday night warned that there would be more than 100 flight cancellations and roughly 200 delays Tuesday morning, the actual numbers appeared considerably worse. The disruption began with a power outage that took place around 2:30 a.m. on Monday at the airline’s Atlanta headquarters.