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ATM network performance: Melbourne

Airborne delay

The 75th percentile performance figures for airborne delay at Melbourne are indicated in  Figure 6. August performance (1.0 minute median and 3.8 minutes 75th percentile) did not meet the targets. Compared to the same month last year the median delay was steady and the 75th percentile decreased (from 4.3 minutes).  The long-term trend for airborne delay at Melbourne is upwards. However, the 24-month trend is flat.

Figure 6: Melbourne airborne delay 75th percentile (last 24 months)

Click image to enlarge

Notable events

The following commentary describes the most significant airborne delay events during August in Melbourne.

03 August (0800-1000 & 1700-1800 local) – Delay 9.5 minutes

  • Concentration of demand due to off‑schedule international arrivals during morning peak period.
  • Following an extended period of low capacity due to single runway operations, airborne delay built up in the early evening.
  • Airborne delay was also impact by two MEDEVAC flights in the busy evening period.

08 August (0800-0900) – Delay 4.7 minutes

  • Concentration of demand due to off‑schedule international arrivals, and early and late non‑compliant flights during morning peak period.

10 August (0700-0900 & 1900-2000 local) – Delay 9.0 minutes

  • Concentration of demand in the morning and evening peak periods due to late non‑compliant flights during an extended period of single runway operations.
  • The low capacity during single runway operations did not enable this concentration to be absorbed which resulted in increased airborne delay.

14 August (1900-2000 local) – Delay 5.3 minutes

  • Concentration of demand due to late non‑compliant flights during the morning peak period.

15 August (0800-0900 local) – Delay 6.1 minutes

  • Concentration of demand due to late non‑compliant flights during the morning peak period.

30 August (0700-0900 & 2000-2100 local) – Delay 7.7 minutes

  • Concentration of demand during the morning peak due to off‑schedule international arrivals and late non‑compliant flights.
  • Following an extended period of low capacity due to single runway operations, airborne delay built up in the early evening.

31 August (0800-1000) – Delay 7.0 minutes

  • Concentration of demand due to late non‑compliant flights during the morning peak period.