Hmmm,
Just apply to Qantas, get on the hold-file, and wait...
Eventually the wholly-owned-but-completely-seperate subsidiary called Jetstar will call you. You'll wonder how they knew about you for a nanosecond, then you'll start weighing up their offer. As Mr Joyce has said on ABC radio, for a very competitive fee they'll let you fly their planes and you can be portable because you won't owe the company anything. Therefore, once you start with them, the the world is your oyster because you can expect rapid progression, quick command and soon have the experience for a better-paying job on the wider global market.
Simple really.
