United Airlines has grounded flights nationwide on Wednesday night due to an issue with its weight and balance computer system.

United Airlines flight schedules are slowly 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,

United said it was treating the technology issue as a controllable delay, meaning it would pay customer expenses such as hotels.