why not Holsworthy? extend the current runway obviously, its far enough from residential areas for noise to be no consideration, not only that, no one complains of the weapon fire noise around here, rail link is very close, just extend off Glenfield station, new Freight depot is planned for Moorebank, the M7 and M5 very close, and the airspace is already restricted, so can easily be changed to class C without disrupting existing airspace, and all flight paths will arrive and depart to the south, over virgin bushland.