Mr Baxter,
Jetstar and everyone else has to abide by the most stringent rules - see s7(c) and s28BD of the Civil Aviation Act 1988 and Chapter 3 of ICAO Annex 6.
There is no room for the accountants running Jetstar or any other AOC to gain any competitive advantage through State differences. I am sure CASA would be auditing each Australian AOC for compliance with all foreign requirements as part of their audits of International AOCs....
except, of course, the one issued to fly more than 12 miles off the coast that begin and end in Australian territory within entering any other State's territory
Stay alive,