US is investigating Delta's flight cancellations and faltering response to global tech outage

abcnews.go.com:

U.S. airline regulators have opened an investigation into Delta Air Lines, which is still struggling to restore operations on Tuesday, more than four full days after a faulty software update caused technological havoc worldwide and disrupted global air...

U.S. regulators are investigating why Delta Air Lines failed to recover as quickly as other airlines from a global technology breakdown and whether Delta's treatment of passengers stranded by canceled and delayed flights violated federal rules.

Transportation Secretary Pete Buttigieg on Tuesday announced the investigation into Delta's response to the outage, which he said has affected more than half a million of the airline's passengers.

A Delta official said the airline expects to return to normal operations by the end of the week.

Delta and its Delta Connection partners canceled more than 500 flights Tuesday. That was down by more than half from Monday but still accounted for nearly two-thirds of all canceled flights in the United States, according to tracking platform FlightAware.

Many airlines were affected when cybersecurity company CrowdStrike sent a faulty update to more than 8 million Microsoft computers around the world late last week. Most of them reduced cancellations to roughly normal levels by the end of the weekend.

Atlanta-based Delta and its partners have canceled more than 6,500 flights since Friday, far more than any other airline, according to figures from FlightAware and travel-data provider Cirium.

Buttigieg said his department will investigate “how it could be that days after the other airlines are back to normal, Delta is still canceling hundreds of flights.”

At a news conference, Buttigieg said the Transportation Department will also examine