Most people in the world do not take flights. There is no global reliable figure, but often cited estimates suggest that over 80 percent of the global population have never flown. In this blog post for Our World In Data, Hannah Ritchie draws on data and research on CO2 and Greenhouse Gas Emissions and Energy to find that aviation accounts for around 2.5 percent of global CO2 emissions. The fact that aviation is a relatively small contributor to global emissions as a whole, but of large importance to individuals that fly, is due to large global inequalities. Her blog assesses how emissions from aviation vary across the world, and where people have the highest CO2-footprint from flying.
https://ourworldindata.org/carbon-footprint-flying

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