There is a common misconeption amongst older aus aviators that AIPA pilots hate Jetstar pilots. What absolute rubbish.
Most of the guys i work with are smart enough to leave their emotions at the door when it comes to contract negotiations. It is not about picking a team to barrak for. It's about ensuring the future stability of your careers.
There are no winners in this game. It's all about contract negotiation.
The stronger the union the more power it has to negotiate a better contract for you.