Today we once again delivered air in trace. While yesterday there was some snow, and a lot of snow to the west and north, today was nothing but bitter cold. At 8:45am, when I got to my package car, all 9 of my air stops were already loaded. Instead of delivering these air on time, or at least first, we were held in the building for an hour and a half and told to deliver in trace and to use weather as an excuse for missed commitments. This was done in order to process 3 trailers of ground packages? What an empty guarantee we offer now a days.