USA - Thousands of flights were canceled or delayed, some areas struggled under more than a foot of snow and more than 200 million people faced a freezing forecast Tuesday as a historic Arctic air mass swept across much of the nation. Bitter cold temperatures were reported from the Canadian border to South Texas. The freeze was moving east, headed for a swath from New England to Florida. Chicagoans awoke to single digits, a few inches of snow and a forecast high of 20 degrees that would smash the city's record for the date by 8 degrees. That's after an American Eagle flight slid off a runway Monday while landing at O'Hare International Airport. No injuries were reported. The National Weather Service in Chicago warned that the combination of air temperatures and blustery northwest winds had sent wind chills below zero.