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War Memorial in Canberra ACT has many restored/preserved aircraft on show. Well worth a visit to see how it used to be.
You may even be fortunate enough by prior arrangement to join a group being shown around the Memorial Annexe where many more gems from the past are being preserved.
Then there is the RAAF Museum at Point Cook (the oldest military airfield in the world) which has a fine collection
Temora in south central NSW is another where you could spend a full day. Occasional flying displays of some oldies.
All have good websites readily found via Google.