Air travel remained severely disrupted Saturday in the U.S., with inclement weather in several parts of the country adding to the disruption to global skies from the Omicron variant COVID-19 outbreak.
  The United States had 2,660 flights cancelled since the beginning of the day, more than half of the 4,617 that have been cancelled worldwide), at around 7:30 p.m. (00:30 GMT), according to the FlightAware website.
 In addition, 4,798 domestic flights to and from the U.S. were or were delayed Saturday, out of a total of 9,432 for the day worldwide.

The most affected U.S. airline was SkyWest, which had to cancel 23 percent of its flight schedule, according to the site.

In the United States, the airports of Chicago (north) were particularly affected, with about half of the flights departing or arriving there cancelled, because of difficult weather conditions, a snowstorm is expected in this region Saturday afternoon and overnight.

And passengers should experience a new complicated day on Sunday, the day of return from the Christmas vacations: the site reports 1,175 cancelled flights for the United States, and 2,134 worldwide.

The world air transport remains very disrupted by the Omicron variant of the coronavirus, extremely contagious. Many pilots and flight crews are absent after contracting Covid-19, or are in contact and therefore in quarantine, forcing airlines, which do not have enough staff to operate flights, to cancel them.

Approximately 7,500 flights were cancelled by airlines around the world over the Christmas weekend.