Might add that pilots will need to pay full Oz tax, as the Oz ATO works on the residence idea, not where you sleep or work, 23AG is dead. And the HK IRD works on the where the company is controlled idea. An airline cannot fly internationally out of HKG unless it is controlled from HKG, the 51% ownership rule (like Oz and SIN) does not apply in HKG.
CX pilots based in Oz pay full Oz tax, they are employed in Oz and are under Fair Work Oz, and also pay full HKG tax despite not working or living in HKG.
Jetstar will also need to justify the requirement for work visas, more than likely given an immigration stipulation to employ a reasonable percentage of locals in each employment group. HKG does not have GA, so that means an expensive cadetship which people cannot be bonded for under HKG law.
And lastly, HX and UO also have another 100 aircraft on order (so does CX/KA), does AJ think they will sit idle ? They are part of the Hainan Airlines group, the fourth largest airline in China.