Saturday air is classified as a PT air day, there should be a list of eligible PT volunteers and a list for FT guys to sign to work as well. All Saturday delivery work is offered up to PT employees first, if all PT asked or that are qualified refuse, then they ask FT drivers in seniority order. If you still don't have enough, then they force from the bottom of the PT qualified list up. Around here most guys get tired and get plenty of hours during the week, FT and PT, this leaves Saturday wide open for guys like me who will gladly work an extra 5-6hrs at overtime rate.