Well it appears not all international Aircrew are staying at hotels, and of those that are, thaey are not necessarily the quaratine ones managed by ADF, NSW Police. This was how the hotel worker was exposed, not in the Qurantine hotel where they also worked but next door in the regualr hotel where US Air Crew were staying. They also have the option to isolate at home.
'Doesn't make sense' to treat flight crews as less risky than passengers, epidemiologist says this article states:
Australian-based crews must enter quarantine upon their return to Australia. This lasts for 14 days or until their next international departure — whichever is shorter.
But they do not have to quarantine in hotels. They can quarantine at home if they live alone, or have a separate bathroom and sleeping area to the rest of their household. They can also take a domestic flight to their next point of departure from Australia if necessary.
Even when they do choose to quarantine in hotels, they are not subject to the same treatment as international travellers, NSW Health Minister Brad Hazzard said.
He said the "inclination" of the NSW Government at this point was to quarantine international air crew in the same way as any other international visitor or Australian returning home from overseas.
"The difference would be that they are in a quarantine environment but not necessarily for the full 14 days, because they have turnarounds between 24 and 72 hours," he said.
I would think it would be be wise to put inetrnational crew in airport hotels (walking distance of terminal if possible) so they dont have to be driven into the city and back, make properties airline crew only.