The 75th percentile performance figures for airborne delay at Brisbane are indicated in Figure 7. December performance (0.8 minutes median and 3.5 minutes 75th percentile) did not meet the targets. Compared to the same month last year, the median and 75th percentile of airborne delay were steady.
The long-term (48‑month) trend for airborne delay at Brisbane is downwards. However, the 24‑month trend is flat.
Figure 7: Brisbane airborne delay 75th percentile (last 24 months)
Click image to enlarge
(minutes – 75th percentile)
(Contributing causes to increased delays)
|06 December||20-21||6.7||Concentration of demand due to longer than anticipated flight times during the evening peak period.|
|07 December||19-20||5.9||Concentration of demand due to late non‑compliant flights during evening peak period.|
|14 December||16-22||9.9||Reduced capacity due to thunderstorms in the afternoon and evening. Periods of 20 minutes and 23 minutes with no arrivals. Concentration of demand due to late departures from Sydney and Melbourne airports that also experienced thunderstorms.|
|21 December||17-22||9.5||Reduced capacity due to thunderstorms in late afternoon and evening. Level 1 GDP Revision with rates reduced and Level 3 GDP Revision (Ground Stop) due to increasing airborne delay.|
|22 December||18-19||3.4||Reduced capacity due to thunderstorms in the evening. Increased traffic due to aircraft diverted from Gold Coast Airport.|
|23 December||18-19||4.1||Concentration of demand due off‑schedule internationals and late non-compliant flights.|