As a result of the COVID-19 pandemic, air traffic in the US decreased by 33.5% in 2020, which corresponds to 5.3 million fewer flights, compared to 2019. In Europe, the number of flights decreased by 55.2% in 2020 and resulted in 6.1 million fewer flights compared to 2019. The higher reduction in Europe appears to be linked to differences in terms of market composition and the varying national measures implemented by European States to fight the COVID-19 pandemic. The report shows that domestic traffic was less affected than international traffic on both sides of the Atlantic. (....)