The biggest aviation market in the world – by far – is the U.S., based on the number of departing seats. So this isn’t just domestic flights, it’s domestic flights plus outbound international flights as well.
Airline Weekly (subscription) compiles data on the biggest aviation markets in the world. Here are the top 10.
The EU as a whole is roughly comparable to the Chinese market. The UK as a whole is the biggest aviation market in Europe, though their former colony India is a bigger market still.
Japan is a bigger market than India, though a decade from now will that still be the case? India has nearly doubled in the past seven years. (So has China.)
Indonesia has more than doubled in the last seven years which is why it’s now a larger market than Germany which is far more mature. The biggest growth though has been in Vietnam which doesn’t crack the top 10 — or even top 20.. yet.
By the way the only U.S. airline among the top 10 fastest growing in the world is Spirit, which grew capacity 18% in 2017. Alaska Airlines clocked in at 8% (23rd) and jetBlue 6% (26th). The biggest growth is in Asia with Hainan Airlines, IndiGo, EVA, AirAsia, and Lion Air all checking into the top 10 for 2017 growth.