Hi imarks,

You probably already know this, but Business Class is not available Perth to Alice Springs. QantasLink operates this route with all economy 717s. If you where to slum it in economy you would still have an excellent flight [QantasLink is great].

Note that if you decide to re route, no QantasLink flights offer Business Class. While the BAe146 retains the J cabin, it is sold as all economy.

Hope that helps somewhat