Concentration varied widely by destination in the last pre-COVID year. One airline carried every passenger on the Qatar corridor, while the China, United States and New Zealand corridors were each shared among several.
What this shows: The chart plots Herfindahl-Hirschman index (HHI).
Conditions and method
BITRE (Australia’s transport statistics bureau) counts an international passenger under the country where they board or leave the flight to or from Australia, within one flight number, not where the journey begins or ends. A hub country such as Singapore therefore includes passengers travelling on beyond it.