Omicron-related disruptions cause over 4000 flight cancellations to kick off 2022

Over 4,000 flights were cancelled around the world on Sunday, more than half of them U.S. flights, adding to the toll of holiday week travel disruptions due to adverse weather and the surge in coronavirus cases caused by the Omicron variant. The flights cancelled by 8 pm GMT on Sunday included over 2,400 entering, departing from or within the United States, according to tracking website FlightAware.com. Globally, more than 11,200 flights were delayed. Among the airlines with most cancellations were SkyWest and SouthWest, with 510 and 419 cancellations respectively, FlightAware showed.