The delays in Perth are due to the growth in mining activity and have not been supported by increased capacity in airspace or landing spots. When we operate with only one runway there are only about 24 landing slots per hour which when there are more than 30 aircraft scheduled to arrive within 30 - 35 minutes, it is inevitable that there will be delays. The mix of aircraft types also makes it unlikely that all spots will be used.
The route structure does not support the amount of traffic there is now during peak times and the main problem with the route structure is caused by the amount of RAAF airspace close to Perth.
The fact still remains however that the delays are still mainly on Tuesday, Wednesday and Thursday only, the rest of the days are still fairly delay free.