Air transport is the fastest-growing issue of anthropogenic CO2. One Boening 747 can emit as many CO2 as 240 cars during a year. Presently technologies of free-emission planes are at a very early stage of development and are impossible to mass application.
This doesn't mean that airlines are unable to participate in the process of decarbonization of the world economy. Idea CAT assumes that emitters which are unable to reduce emission in their industry will be allowed to invest money from CAT in emission-free sources of energy in another branch of the economy.
Airlines will be buying a fuel taxed by CAT. When the fuel will be used airlines will be allowed to receive from the budget the CAT subsidies. These subsidies can be used for many purposes. For example to build a wind power station
