I am a part time air driver in the southern region. My center is forcing me on Saturdays and not going by seniority. Can they do this? If not what do I do? I won the bid for the air shuttle and drive it Mon thru Friday. Is this considered a sixth punch? I called my union rep and he said they had to go by seniority and to tell them I an not going to show up. Can they fire me for not showing up? I would like to have some type of written proof from the contract to back this up before standing my ground and not knowing for sure. I have tried to deal with this before and only got threats about changing my schedule to a Tues - sat and Mon will be the extra work. If that is the case should the seniority rule still apply. If they put my name on the list and force me every time does that deny the senior labor the chance to do the extra work? Could they grieve that. I need some help figuring this out.