It’s very common that the QANTAS site does not show QF availability when trying to book travel originating outside Australia. For example, try booking QF24 ( BKK-SYD), maybe see 1 or 2 seats in J per year, if that. QANTAS tries to push everyone onto Jetstar, or CX, or EK/CX ( at hugely inflated points). It’s so blatant that QF does not even show up as ‘no seats’...perhaps they’ve given up pretending and wasting everyone’s time. It’s a loathsome airline.