Following this summer’s strong traffic recovery, we have reviewed CO2 emissions from European flights, comparing the first nine months of 2021 with the same period in 2019. While restrictions on short-haul and long-haul travel continued from 2020 into 2021, these had significantly eased on short-haul intra-European flights by the summer. All CO2 emissions from a flight are assigned to the country of departure, so here we report just on departing flights: there were 50% fewer departing flights so far this year than in the same period in 2019, in the countries shown on the map. CO2 emissions were down a little more than flights: 54% lower than in January-September 2019. The decline in CO2 is deeper than that of flight departures because medium and long-haul flights, which emit more CO2, have recovered more slowly than short-haul.