Qantas are now allowing you to book Premium Economy fares on the Qantas site from some cities that were previously not showing up on the site as Premium Economy "from" destinations.

Eg - BNE-HKG or BNE-LAX.

Previously you could only select "Economy" or "Business/First" ex Brisbane, whereas the same destination with a start of Sydney had "Economy", "Premium Economy" and "Business/First".

Of course all routes fly through Sydney/Melbourne, except for some Jetstar flights. The JQ ones push you to the Jetstar website to book.