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ATM network performance: Perth

Airborne delay

The 75th percentile performance figures for airborne delay at Perth are indicated in Figure 11. November performance for the median (-0.4 minutes) and the 75th percentile (1.6 minutes) met the targets. Compared to the same month last year, there was a decrease in the airborne delay median performance (from -0.3 minutes) and an increase in 75th percentile performance (from 1.5 minutes).

The 24-month trend for airborne delay at Perth is upwards.

Perth airborne delay

Figure 11: Perth airborne delay 75th percentile (last 24 months)

Distinctive events

Table 7 describes the distinctive events during November in Perth.

Day Event Category Delay
(minutes – 75th percentile)
Event Descriptions
(Contributing causes to increased delays)
27 November 3.1 Afternoon: Harmony outage from 1510 until 1821 local resulted in flights unable to adjust off-block time information leading to a concentration of demand due to non-compliant flights.

Table 7: Distinctive event descriptions for Perth.