Straight from the Qantas Agent’s site. I used to work there in the 2000’s - finished up around 2012. The technology to differentiate between availability “in the PNR” and normal availability came in around 2010ish if i remember correctly. Also, another reason why outsourced agents probably cannot find the same seats as people looking online, is that QF agents had to “emulate” to where the customer was. EG Availability for passengers travelling ex AUS was different to passengers travelling ex USA. If a call came through from the USA, you had to “Emulate” to the USA and access what was available for the ex USA market. If the next call was from Australia, then you’d emulate back to Australia. The Hobart agents have been around since I was there, so they’d know that, but the outsourced ones probably never got the memo, hence the difference of what we can see here, and what they can see there.
Lufthansa and Qatar do the same thing, but Lufthansa takes it a step further. With LH, you need to book in the order of flights. The first outbound flight booked will then alter availability on the next flight you’re looking at. Makes it a tad difficult when you check say Frankfurt to Singapore for seats, but then you start your journey in London to travel London, overnight stop, then Frankfurt to Singapore next day for instance. The GDS changes the Frankfurt Singapore availability and prices, and you haven’t even created a PNR yet!
The dark arts of yield management.