The 75th Percentile performance figures for airborne delay at Brisbane are indicated in Figure 6. January performance (3.1 minutes) met the target (3.5 minutes) and airborne delays were lower than same period last year (3.2 minutes). The long-term trend for airborne delay at Brisbane is downwards.
Figure 6: Brisbane airborne delay 75th Percentile
Click image to enlarge
The following commentary describes the most significant airborne delay events during January in Brisbane:
- 02 Jan – Evening thunderstorms (1800 – 2100 local) and a Level 1 revision conducted in advance at midday
- 13 Jan – Evening thunderstorms (1800 – 1900 local)
- 28 Jan – Program accuracy issues
- 31 Jan – Evening thunderstorms (1800 – 1900 local)
The event on 28 January was subject to a detailed analysis (Appendix B) following an abnormal increase in arrival delay during the peak evening period. This resulted from the late arrival of six aircraft immediately prior to the peak period. The impact of these late arrivals cascaded into delays for the following two hours. The elevated arrival delay occurred despite benign weather conditions and the throughput achieved by ATC was above set tactical rates for much of the period. This illustrates the impact that a small number of non-compliant flights can have on arrival delay.