Is there an abnormally high number of airs on christmas eve because every year we start later and later on that day to accomodate for potentiallly having late airs. like 2 weeks in advance the company posts a later start time assuming there will be late airs. it seems to me the best approach would be to start at a normal time, deliver as many of your grounds as possible and have meet points for airs. hell, most have been delivered in trace anyway. and by getting an earlier start time 1- the employees would be home earlier to make "the most important stop of the day" with their families and 2- the customers would get their xmas gifts in time to actually wrap them and put them under the tree.