And even with delays likely expected, Ellzey said it would take extreme weather to shut down a major U.S. airport like DFW: A blizzard with high winds, a major power outage or "zero-zero" visibility conditions, meaning fog is too heavy for pilots to see above or in front of their aircraft.

Nearly half of all flights in and out of DFW International Airport and Dallas Love Field are canceled with snow and sleet falling throughout the region and more expected through Thursday. Almost 1,000 departing and arriving flights at DFW International Airport have already been scrapped for the day and another 200 at Dallas Love Field,

In total, more than 1,600 flights have been canceled at DFW Airport and Love Field, according to Flight Aware. If your plane is still scheduled, airlines ask passengers to arrive early and to be flexible if planes are rerouted or rescheduled.