You have a fixation with Jetstar.
So lets ignore the lack of merit in your proposed legal case and think this one through as if you had some chance of success.
Despite your complaints about Jetstar, it remains an asset that has significant value. So if you were able to have some success tackling Jetstar then Qantas would be forced to sell it. It wont be closed down, it is way too late for that, it has too much value.
Jetstar then falls into the hands of a third party. This third party may be more cashed up than Qantas and it wont be hamstrung by the Qantas Act or any historical EBA obligations and its Australian businesses can be foreign owned (utilising the Virgin International structure). The new Jetstar owner wont have to worry about any market segmentation to protect Qantas mainline.
Is this what you want to achieve?