Never thought I'd say this, but I agree with Wally
I have been working in airlines for just on 20 years with "just" year 10 (or fourth form, as we used to call it).
The reality is that all you need is a
sound, basic understanding of high school maths in this industry.
Airlines use education (HSC) purely as a screening tool. There are still a few enlightened airlines left in Australia that place higher emphasis on the individual as a whole, as opposed to purely education.
Unfortunately, Speedbird, to have the best chance of scoring an airline gig in AUS, you will need year 12 maths.