Delta Air Lines struggled for a fourth straight day to recover from a worldwide technology outage caused by a faulty software update, stranding tens of thousands of passengers and drawing unwanted attention from the federal government.
The airline's chief executive said it would take "another couple days" before "the worst is clearly behind us." Delta's chief information officer said Monday that the airline was still trying to fix a vital crew-scheduling program.
Other carriers were returning to nearly normal levels of service disruptions, intensifying the glare on Delta's relatively weaker response to the outage that hit airlines, hospitals and businesses around the world.
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