In 2012 aviation was included in the EU ETS. Surrendering allowances (EUAs) annually is something all airlines have to do along with other industry included in the scheme. The idea is that by limiting the number of allowances the industries that can make CO2 cuts easily will do so and sell any excess EUAs to industries that cannot make cuts as easily. Carbon prie were around 3% of operation costs in 2018 but have jumped t around 14% in 2019 due to the increase in carbon costs (€28 per ton of CO2 in 2019 vs €5 per ton in 2018).
Did you know you can check the carbon emissions of each airline within the European Economic Area? One of the pillars of the EU ETS is transparency. Click the picture to access the EU transaction log. You can search for any airlines which fly within Europe and find out what their total annual emissions were (within the EEA).