There was a proposal some years back by local Sunraysia business people to extend one of the RWYs at Mildura to take up to 747 sized aircraft, both to theoretically fly local fruit produce including from S.A. direct to overseas markets, and fly in tourists.
The parties then became aware that it wasn't simply a RWY extension exercise, but an upgrade of the airport to international standard was required, with the associated Customs, AQIS & Immigration presence, airport security upgrade etc. etc., and the proposal died.
However the Chinese would probably have the money to make this all happen somewhere if they deemed it worthwhile
