Our center has six PM air drivers. Two are part-timers - the highest seniority is 1991 The other 4 are 22.3 air driver/insider. The highest seniority 22.3 is 1995. They are all on the same vacation schedule, because we can only have 1 air driver out at time. What would be the order of selecting - by seniority date regardless of part-time or 22.3 status or would 22.3 select first? One of the 22.3 has a seniority date of 2006 - is it fair for him to pick prior to part-timer with 1991 seniority?