Everything in triplicate
When dealing with Qantas Management get everything in writing and in triplicate.
Make sure it is witnessed by the local priest,your local member of parliament,a QC and Allan Joyce's mother.Also make sure it is read and understood by a union official and five of your closest friends.If there is any disparity in the reading and understanding of the document or the circumstances then dont do anything.
In short dont trust the bastards