Omicron variant is worrying public health officials, complicating holiday travel Dec 20, 2021 1:30 pm by The Washington PostIllinois in the News Share on Facebook Tweet Email Images Washington Post (Dec. 17) 'Delta gave a body blow to air travel, and now with omicron there’s a great deal of speculation of what it means. Until more data is available, it’s hard to predict,' says Professor Sheldon Jacobson. Share on Facebook Tweet Email