There has been an unusual “ground stop” at Pearson Airport. The problem is blamed on the frigid weather and has stalled the unloading and loading of planes. CP says passengers became angry and airport authorities called the Peel Police to restore order. It seems unusual for cold weather to cause a ground stop in the way the term is normally understood. While the cold might slow down machinery on the ground it should not impair the ability of aircraft to take off or land. The latest tweets from the airport (at 9.15 a.m.) say that incoming flights are delayed to 10 a.m. Tuesday January 7, 2014 at the earliest. Canadian Press