As part of the EU's Fit for 55 package, the Commission has proposed a comprehensive set of changes to the existing EU Emissions Trading System (EU ETS), which should result in an overall emissions reduction of 61 per cent in the sectors concerned by 2030 compared to 2005. The increased ambition is to be achieved by strengthening the current provisions and extending the scope of the scheme. Aviation has been included in the EU ETS since 2012, and it applies to flights between airports in the European Economic Area. During aviation's third emissions trading period, which started in 2021, the total number of emissions allowances will be reduced annually with a linear reduction factor of 2.2 per cent. According to the proposal, the free allocation of allowances will be phased out by 2027, and their linear reduction factor will be tightened from 2.2 to 4.2 per cent from 2024. The Carbon Offsetting and Reduction Scheme for International Aviation (CORSIA) aims to address any annual increase in total CO emissions from international civil aviation above 2020 levels. Under CORSIA, aircraft operators will be required to purchase offsets for the growth in CO emissions covered by the scheme from 2021. Finland welcomes that CORSIA will be integrated into the EU ETS and will be implemented in it.