United Airlines flight schedules are gradually returning to normal after a nationwide technical issue forced flight cancellations and delays Wednesday night. Residual delays and cancellations continued Thursday morning for United Airlines flyers at Chicago’s O’Hare International Airport after one of the airline’s computer systems went down Wednesday night,

A United Airlines ground stop has been lifted at multiple airports across the country. The ground stop impacted major hubs like Chicago O'Hare International Airport for hours, causing long waits and extensive delays for passengers arriving and departing.

United Airlines flights on major routes were grounded Wednesday because of a technology issue, and additional flight delays were expected into the evening, the airline said.