Atlanta-based Delta Air Lines was among those around the world hit by a tech outage Friday affecting many Microsoft users.
But even after other airlines and companies recovered within about 24 hours or so, Delta’s operations went into a full-blown meltdown, with more than 5,000 flight cancellations over the past few days and hundreds more Monday, according to FlightAware.com.
On Sunday, Delta CEO Ed Bastian apologized in a letter to customers and gave an explanation of why his airline has been more severely affected than other companies and has struggled to recover.
He also explained the airline still has not restored full functionality to its operation.
Bastian wrote that Delta has “a significant number of applications that use (the Microsoft Windows operating) system, and in particular one of our crew tracking-related tools was affected and unable to effectively process the unprecedented number of changes triggered by the system shutdown.”