They RAAF got their 'carports' at Amberley, East Sale and Pearce in the 80's, Willy got them in the late 90's or early 00's.
Not to mention all the FBO's in the USA that have large 'carports' that allow jets to taxi in and out. Given the high rates of skin cancer in Australia, Australian airports and FBO's should be pushing for changes to the regulations.