C,
D verses
E
This took me a while to find, so please take the time to consider it, I am out west in NSW so not much internet access.
From the CASA OAR YMAV study
1.4.3 The cost of the provision of a Class C air traffic control service is the same as that of a Class D or E service. However, the Class C service provides significantly greater risk mitigation to passenger transport aircraft against VFR aircraft threats than that provided by Class D and Class E.
Point 7
The cost of provision of a Class C Aerodrome Control Service is the same as that of a Class D Aerodrome Control Service but the risk mitigation provided by a Class C service is significantly higher for IFR aircraft with respect to VFR aircraft. Similarly, the cost of provision of a Class C radar Approach Control Service is the same as that of a Class E service but the risk mitigation provided is significantly higher for IFR aircraft with respect to VFR aircraft.
Similar documentary evidence appears in all recent airspace studies.
Who needs to get real?
SQ