Air Canada said that more than 623 flights had been cancelled by Friday evening, affecting more than 100,000 people.

According to KOMV in St. Louis, Southwest is cutting direct flights to five others cities, including Little Rock, Tulsa, Charlotte, Des Moines and Oklahoma City.

The Ohio National Guard gave NBC4 a rare front-row seat to see their work from above after we were invited on a Black Hawk helicopter training flight.