Around 3,364 flights were cancelled and 3,155 delayed due to plummeting temperatures in the US, FlightAware.com reported.
Major US airline JetBlue Airways today grounded flights for 17 hours at four of the busiest airports in the country.
More than half of the flights in or out of Chicago's O'Hare International Airport were cancelled after temperatures in the Windy City plunged to -15.
As much of the US experiences a dangerous and severe cold spell, does the UK have anything to worry about?
As the US battles sub-zero temperatures, ITV News Washington correspondent Robert Moore illustrates just how cold it is in Minnesota.
Leaders across America are urging residents to stay in their homes as "polar vortex" batters the east coast after snowstorm Hercules.