What are the exemptions for ADSB in the USA
1. ADS-B is not required until 1 Jan 2020, which is Dick's whole point. Australia is requiring ADS-B now above F280, but there is no available products for many aircraft because the manufacturers are working to the US timeline.
2. My point is at all aircraft have an exemption below 10,000 ft in Class E and it is not required in Class G. Australia is on its own in the world in requiring ADS-B for IFR aircraft in all levels and all airspace types.