US opens investigation into Delta after airline cancels thousands of flights

Transportation department says move aims to ensure care of passengers after global cyber outage snarled operations

The US transportation department said on Tuesday it was opening an investigation into Delta Air Lines after the carrier canceled more than 5,000 flights since Friday as it struggles to recover from a global cyber outage that snarled airlines worldwide.

While other carriers have been able to resume normal operations, Delta has continued to cancel hundreds of flights daily because of problems with its crew scheduling system.