Don't know if similar things are happening in Oz, but in the UK airlines are reducing the number of flights, or like BA cancelling the LHR to BKK route all together. Apparently this is because nobody is flying LHR to BKK for business anymore, and BA made most of their profits from business users.
The knock on effect is it's more difficult / expensive to get to Thailand than it used to be.
From the UK I believe Thai are the only airline offering direct flights to Thailand now.
I've looked at going via Singapore using SIA / BA, but again prices are through the roof.
Shame, because all this will slow Thailand's much needed recovery. Personally I can't wait much longer, and I reckon I'll bite the bullet for August time.