Late air is a regular occurrence at our center this time of year. I am an exception air driver. This is the first time in my four years of driving that I have been denied work. Management decided to use full time drivers to shuttle late air today instead. It has always been my understanding that this work is to go to air drivers first; this has also been the practice at our center in the past. We over hired seasonal drivers for peak, I think. Should I file a grevience?