The extreme cold snap might also upset millions of Americans’ Christmas travel plans. Snow, ice and strong winds threaten to massively affect traffic on the road and in the air. The weather service advised once morest driving in parts of the country that were particularly affected by the cold. The situation can be life-threatening if you break down on the road with the car. The country’s major airports have already canceled thousands of flights, writes the BBC. In anticipation of travel disruptions, major airlines such as United, Delta and American have offered to waive fees for travelers who want to rebook their flights.(DPA/jar)