The 75th percentile performance figures for airborne delay at Melbourne are indicated in
Figure 9. May performance for the median (1.1 minutes) and the 75th percentile (4.2 minutes) did not meet the targets. Compared to the same month last year, there was a decrease in the airborne delay median performance (from 1.2 minutes) and no change to the 75th percentile.
The long‑term (48-month) trend for airborne delay at Melbourne is upwards.
Figure 9: Melbourne airborne delay 75th percentile (last 24 months)
Table 3 describes the notable airborne delay events during May in Melbourne.
(minutes – 75th percentile)
(Contributing causes to increased delays)
|2 May||07-08||6.2||Concentration of demand due to off‑schedule internationals and enroute weather diversions during busy morning period.|
|9 May||07-08 &
|8.3||Reduced capacity in peak morning period due to winds requiring single runway operations earlier than planned.
Concentration of demand due to late non-compliant flights during extended period of low capacity (single runway operations).
|10 May||07-12 &
|15.3||Concentration of demand in the morning due to off‑schedule internationals at the beginning of a busy period with low rates.
Concentration of demand in the evening due to late non‑compliant flights at the beginning of a busy period.
|17 May||17-18||3.9||Concentration of demand due to late non‑compliant flights in the busy period evening period.|
|24 May||08-09 &
|10.6||Concentration of demand due to off‑schedule internationals in the busy morning period.
Concentration of demand due to late non‑compliant flights in the busy evening period.
|27 May||08-09||4.5||Concentration of demand due to late non-compliant and off‑schedule international flights during morning peak period.|
|30 May||07-08||6.2||Concentration of demand due to late non-compliant and off‑schedule international flights during morning peak period.|
|20.1||Reduced capacity due to low cloud impacting visibility. Tactical rates reduced in the morning. Level 1 GDP Revision at 1415L with reduced rates. Further tactical rate reductions required in afternoon and evening.|
Table 3: Notable event descriptions for Melbourne.