Seniority in a class is in order of age (oldest is senior, and gets first pick of equip/base). My class was all A320 JFK. Some classes were all E190 BOS, some mixed, you never know. Management decided to give us a 13%/3.5%/3.5% raises for 2014/15/16, but no raises for 1st year pilots.. They also removed premium pay for flying over 78hrs. Plan accordingly.