There are now 4 categories of airports as far as security goes. The change happened a few years ago.
AVIATION TRANSPORT SECURITY REGULATIONS 2005 - REG 3.01B Categories of security controlled airports
Can't find where they are defined but I believe it has something do with annual passenger numbers.
QLink in QLD routinely operate their Q400's into ports which are deemed 'unscreened' and the passengers are bussed to a specific gate in BNE where they exit the terminal directly to a landside location.