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ATM network performance: Brisbane

Airborne delay

The 75th percentile performance figures for airborne delay at Brisbane are indicated in Figure 10. March performance (1.2 minutes median and 4.0 minutes 75th percentile) did not meet the targets. Compared to the same month last year, there was an increase in the airborne delay median performance (from 1.1 minutes) and a decrease in the 75th percentile performance (from 4.2 minutes).

The long-term (48-month) trend for airborne delay at Brisbane is downwards and 24-month trend is steady.


Figure 10: Brisbane airborne delay 75th percentile (last 24 months)

Notable events

Table 7 describes the notable airborne delay events during March in Brisbane.

Day Local Time Delay

(minutes – 75th percentile)

Event Descriptions

(Contributing causes to increased delays)

07 March 12-13 &


9.0 Concentration of demand during middle of the day due to late no-compliant flights.

Concentration of demand during peak evening period due late non-compliant and MEDEVAC flights.

13 March 07-08 5.9 Reduced capacity due to unforecast fog in early morning. Tactical rates reduced for the 06L hour causing concentration of demand during the busy morning period.


15 March 16-19 16.8 Reduced capacity during the late afternoon and early evening due to thunderstorms. Ground stop from 1640-1700L. Periods of 21 and 26 minutes with no arrivals. Level 2 GDP Revision with rates increased near end of program.
17 March 16-18 4.7 Increased delay in the afternoon and evening due to deviations around heavy storms.
18 March 14-15 3.8 Reduced capacity during the afternoon due to thunderstorms. No arrivals for 24 minutes.
27 March 17-19 8.3 Reduced capacity during evening peak period due to low visibility from showers and low cloud. Tactical rates reduced.

Table 7: Notable event descriptions for Brisbane.