One option could be to try the Pilots Federation.
http://www.afap.org.au/
It would be interesting to see the rates they are paying if you are a contractor? One would expect to have a contract in writing. otherwise I would be suggesting you are an employee.
Are they taking tax out of your wage or expecting you to pay that?
If you are a contractor, you may be liable for you own workers comp, super, leave and PAYE tax deductions etc.
Your rate should be AT LEAST 1.5 times the rate you would be paid under the award to cover the extras, I would suggest even up to twice the rate. If you are deemed to be a contractor, is this w@nker paying you a minimum of $45,000 PA to cover your wage and all these extras (SE JOB?).
Perhaps writing a letter to your boss clarifying your work arrangements would be step one and take things from there.
And people ask why I decided to leave this industry.????????