I remember the photo on the front page of the local newspaper when PM Gough Whitlam visited the Baulkham Hills Shire Council chambers, at the time when those chambers were located in the main street through Castle Hill. He was met with a protest. The photo featured one of my little brothers waving a pamphlet in Gough’s face: No Airport For Galston. I assume my little brother had been pressed ganged into service by our parents.
Gough was PM 50 years ago.
The debate about the location of Sydney’s second international airport had raged for many years before that minor skirmish. The Badgerys Creek area had been set aside in the 60s, but lots of other locations - including Galston - were run up the flagpole.
As with aviation safety regulation, airport location is mostly about politics.