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Frequency of domestic routes 2019

One could be forgiven for expecting the world’s busiest domestic air route to link two major megalopolises, each with populations in the tens of millions. However, this isn't the case. Instead, the busiest air route was Jejul to Seoul, which recorded almost 85,500 flights.

Domestic versus international routes

Domestic air routes, defined as commercial flights between two airports that are in the same country, tend to be busier than international air routes. Even the busiest international air route – Hong Kong to Taipei – recorded less than half the number of flights in 2017 than the busiest domestic route.

Causes of air traffic

Population is clearly a factor for high levels of air traffic, with just over half of the busiest domestic air routes involving the most populous global megacities. However, a lack of alternative travel infrastructure can also play a major role. For example, Brisbane, Melbourne and Sydney – which together account for two of the busiest air routes, despite their relatively small populationsare yet to be linked by high-speed intercity rail.

The world's busiest domestic routes in 2019, ranked by frequency of flights

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