"We strongly urge flyers with non-essential travel scheduled before January 2, 2022, to consider changing their travel to a later date using our flexible travel policy", the airline JetBlue said in a statement, encouraging passengers to think about rescheduling non-essential flights during the holidays.
JetBlue said it expects the number of cases to surge in the northeastern US, where most of its crew are based.
Along with the Omicron variant overrunning the United States and sickening flight crews, winter weather has caused numerous flight cancellations.
Health officials have acknowledged that the Omicron variant is more transmissible but the cases are mild and no deaths have so far been reported.