Folks
At London Heathrow, in visual conditions, they manage about 54 movements per hour, per runway.
With Sydney's runway configuration, the ATC operating problem is very similar to Honolulu International. Given Sydney's actual traffic mix, Sydney's theoretical movement rate is about 130/140 per hour, (except for severe westerlies) .
The problem is not physical, it is political, with the 80 per hour movement cap, and the refusal to recognise that current generation aircraft are quiet. Indeed, the ATR-72/-8/SAAB largely do not register on the off airport noise points, the background hubub of Sydney drowns them out. Exempt these "noiseless" aircraft from the 80, and the traffic problem goes away for years.
Tootle pip!!