brought down big trees as you see and across the country, air traffic is snarled on this day before the martin luther king junior holiday. nearly 3,000 flights have been cancelled. following the path of the enormous storm and damage, diane gallagher starts us off in charlotte north carolina and in pittsburgh. di diane, let me begin with you. they re not used to snow let alone a foot. this is icy, dangerous, sticky snow. reporter: that s exactly the problem here poppy. you re seeing these beautiful flakes falling now. this is not what we experienced most of the day in charlotte. it was freezing rain and sleet. if you look at the live drone we re flying, you can see the interstates are cleared off but look wet and that s the biggest concern that there is going to be a freeze again overnight. people are going to feel they re comfortable to drive and they re going to be dealing with tr